diff --git a/.artifacts/08edce59-f9d0-43c1-9cf7-8b294aeca3f0/task.artifact.md b/.artifacts/08edce59-f9d0-43c1-9cf7-8b294aeca3f0/task.artifact.md
new file mode 100644
index 0000000..0776594
--- /dev/null
+++ b/.artifacts/08edce59-f9d0-43c1-9cf7-8b294aeca3f0/task.artifact.md
@@ -0,0 +1,3 @@
+- [ ] Configure `gradle.user.home` and related properties in `gradle.properties` [ ]
+- [ ] Verify Gradle Sync and Build [ ]
+- [ ] Create Walkthrough [ ]
diff --git a/android/gradle.properties b/android/gradle.properties
index f23b18f..fff6691 100644
--- a/android/gradle.properties
+++ b/android/gradle.properties
@@ -1,11 +1,13 @@
 # Project-wide Gradle settings.
-org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m -Dfile.encoding=UTF-8
+org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m -Dfile.encoding=UTF-8 -Dsun.jnu.encoding=UTF-8
 systemProp.android.prefs.root=C:/Android/home
 systemProp.android.user.home=C:/Android/home
 systemProp.android.sdk.home=C:/Android/home
 systemProp.user.home=C:/Android/home
 
 gradle.user.home=C:/Android/gradle
+systemProp.gradle.user.home=C:/Android/gradle
+android.overridePathCheck=true
 android.useAndroidX=true
 android.enablePngCrunchInReleaseBuilds=true
 reactNativeArchitectures=armeabi-v7a,arm64-v8a,x86,x86_64
diff --git a/src/db/outbox.ts b/src/db/outbox.ts
index 08f6ea4..f1ad19c 100644
--- a/src/db/outbox.ts
+++ b/src/db/outbox.ts
@@ -270,3 +270,9 @@ export async function deleteMediaOutbox(uuid: string): Promise<void> {
   const db = await getDb();
   await db.runAsync('DELETE FROM media_outbox WHERE uuid = ?', uuid);
 }
+
+/** Actualiza la ruta local de un fichero (usado tras añadir el sello en 2º plano). */
+export async function updateMediaLocalUri(uuid: string, localUri: string): Promise<void> {
+  const db = await getDb();
+  await db.runAsync('UPDATE media_outbox SET local_uri = ? WHERE uuid = ?', localUri, uuid);
+}
diff --git a/src/screens/CameraScreen.tsx b/src/screens/CameraScreen.tsx
index 57187db..c754426 100644
--- a/src/screens/CameraScreen.tsx
+++ b/src/screens/CameraScreen.tsx
@@ -1,7 +1,8 @@
 import { CameraView, useCameraPermissions } from 'expo-camera';
 import * as Location from 'expo-location';
 import * as ScreenOrientation from 'expo-screen-orientation';
-import React, { useCallback, useEffect, useRef, useState } from 'react';
+import { useFocusEffect } from '@react-navigation/native';
+import React, { useCallback, useRef, useState } from 'react';
 import {
   StyleSheet,
   Text,
@@ -30,66 +31,73 @@ export function CameraScreen({ route, navigation }: Props) {
   const [taking, setTaking] = useState(false);
   const [rotation, setRotation] = useState(0);
 
-  // Detectar orientación física para rotar el sello
-  useEffect(() => {
-    const updateOrientation = async () => {
-      const info = await ScreenOrientation.getOrientationAsync();
-      handleOrientation(info);
-    };
+  // Carga de datos cada vez que la pantalla gana el foco
+  useFocusEffect(
+    useCallback(() => {
+      let isMounted = true;
 
-    const handleOrientation = (o: ScreenOrientation.Orientation) => {
-      // Nota: LANDSCAPE_LEFT es rotar el móvil a la derecha (home button a la derecha)
-      // Queremos contrarrestar el giro para que el sello esté derecho.
-      if (o === ScreenOrientation.Orientation.LANDSCAPE_LEFT) setRotation(90);
-      else if (o === ScreenOrientation.Orientation.LANDSCAPE_RIGHT) setRotation(-90);
-      else if (o === ScreenOrientation.Orientation.PORTRAIT_UPSIDE_DOWN) setRotation(180);
-      else setRotation(0);
-    };
+      const load = async () => {
+        const [cfg, projectId] = await Promise.all([
+          loadFooterConfig(),
+          getActiveProjectId(),
+        ]);
+        if (!isMounted) return;
+        setConfig(cfg);
 
-    void updateOrientation();
-    const sub = ScreenOrientation.addOrientationChangeListener((evt) => {
-      handleOrientation(evt.orientationInfo.orientation);
-    });
-    return () => ScreenOrientation.removeOrientationChangeListener(sub);
-  }, []);
+        let projectName: string | null = null;
+        if (projectId != null) {
+          const proj = await getProject(projectId);
+          projectName = proj?.name ?? null;
+        }
 
-  const loadData = useCallback(async () => {
-    const [cfg, projectId] = await Promise.all([
-      loadFooterConfig(),
-      getActiveProjectId(),
-    ]);
-    setConfig(cfg);
+        const { granted } = await Location.requestForegroundPermissionsAsync();
+        let coordsStr: string | null = null;
+        if (granted) {
+          const loc = await Location.getCurrentPositionAsync({ accuracy: Location.Accuracy.Balanced });
+          const lat = loc.coords.latitude;
+          const lng = loc.coords.longitude;
+          const la = lat >= 0 ? 'N' : 'S';
+          const lo = lng >= 0 ? 'E' : 'O';
+          coordsStr = `${Math.abs(lat).toFixed(5)}°${la}, ${Math.abs(lng).toFixed(5)}°${lo}`;
+        }
 
-    let projectName: string | null = null;
-    if (projectId != null) {
-      const proj = await getProject(projectId);
-      projectName = proj?.name ?? null;
-    }
+        if (isMounted) {
+          setMeta({
+            projectName,
+            date: new Date().toLocaleString('es-ES', {
+              year: 'numeric', month: '2-digit', day: '2-digit',
+              hour: '2-digit', minute: '2-digit',
+            }),
+            coordinates: coordsStr,
+          });
+        }
+      };
 
-    const { granted } = await Location.requestForegroundPermissionsAsync();
-    let coordsStr: string | null = null;
-    if (granted) {
-      const loc = await Location.getCurrentPositionAsync({ accuracy: Location.Accuracy.Balanced });
-      const lat = loc.coords.latitude;
-      const lng = loc.coords.longitude;
-      const la = lat >= 0 ? 'N' : 'S';
-      const lo = lng >= 0 ? 'E' : 'O';
-      coordsStr = `${Math.abs(lat).toFixed(5)}°${la}, ${Math.abs(lng).toFixed(5)}°${lo}`;
-    }
+      const syncOrientation = async () => {
+        const info = await ScreenOrientation.getOrientationAsync();
+        handleOrientation(info);
+      };
 
-    setMeta({
-      projectName,
-      date: new Date().toLocaleString('es-ES', {
-        year: 'numeric', month: '2-digit', day: '2-digit',
-        hour: '2-digit', minute: '2-digit',
-      }),
-      coordinates: coordsStr,
-    });
-  }, []);
+      const handleOrientation = (o: ScreenOrientation.Orientation) => {
+        if (o === ScreenOrientation.Orientation.LANDSCAPE_LEFT) setRotation(90);
+        else if (o === ScreenOrientation.Orientation.LANDSCAPE_RIGHT) setRotation(-90);
+        else if (o === ScreenOrientation.Orientation.PORTRAIT_UPSIDE_DOWN) setRotation(180);
+        else setRotation(0);
+      };
 
-  useEffect(() => {
-    void loadData();
-  }, [loadData]);
+      void load();
+      void syncOrientation();
+
+      const sub = ScreenOrientation.addOrientationChangeListener((evt) => {
+        handleOrientation(evt.orientationInfo.orientation);
+      });
+
+      return () => {
+        isMounted = false;
+        ScreenOrientation.removeOrientationChangeListener(sub);
+      };
+    }, [])
+  );
 
   if (!permission) {
     return <View style={styles.center}><ActivityIndicator size="large" /></View>;
@@ -111,9 +119,9 @@ export function CameraScreen({ route, navigation }: Props) {
     setTaking(true);
     try {
       const photo = await cameraRef.current.takePictureAsync({
-        quality: config?.quality ?? 0.85,
+        quality: 0.9, // Máxima calidad para el raw
         base64: false,
-        exif: false,
+        exif: true,
       });
       if (photo) {
         onCapture(photo.uri, photo.width, photo.height);
@@ -135,7 +143,6 @@ export function CameraScreen({ route, navigation }: Props) {
         autofocus="on"
       />
 
-      {/* Capa de UI sobre la cámara */}
       <View style={styles.overlay}>
         {/* Header con botón cerrar */}
         <View style={styles.header}>
@@ -144,7 +151,7 @@ export function CameraScreen({ route, navigation }: Props) {
           </TouchableOpacity>
         </View>
 
-        {/* Preview del sello (posicionado en su esquina con rotación) */}
+        {/* Preview del sello: posicionado por FooterOverlay, no por este contenedor */}
         {config && meta && (
           <View style={styles.fullOverlay} pointerEvents="none">
             <FooterOverlay
@@ -156,7 +163,7 @@ export function CameraScreen({ route, navigation }: Props) {
           </View>
         )}
 
-        {/* Botón de disparo abajo al centro */}
+        {/* Botón de disparo */}
         <View style={styles.footerControls}>
           <TouchableOpacity
             style={[styles.captureBtn, taking && styles.disabled]}
@@ -176,14 +183,15 @@ const styles = StyleSheet.create({
   overlay: { flex: 1, justifyContent: 'space-between', zIndex: 10 },
   fullOverlay: {
     ...StyleSheet.absoluteFillObject,
-    // No centramos aquí, dejamos que FooterOverlay use sus offsets top/bottom/left/right
+    // IMPORTANTE: Eliminado justifyContent: center.
+    // Ahora FooterOverlay se anclará a las esquinas correctamente.
   },
   center: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#000' },
   message: { color: '#fff', textAlign: 'center', marginBottom: 20 },
   btn: { backgroundColor: COLORS.primary, padding: 12, borderRadius: 8 },
   btnText: { color: '#fff', fontWeight: 'bold' },
   header: { padding: 20, paddingTop: 50 },
-  closeBtn: { width: 40, height: 40, justifyContent: 'center', alignItems: 'center', backgroundColor: 'rgba(0,0,0,0.3)', borderRadius: 20 },
+  closeBtn: { width: 44, height: 44, justifyContent: 'center', alignItems: 'center', backgroundColor: 'rgba(0,0,0,0.4)', borderRadius: 22 },
   closeTxt: { color: '#fff', fontSize: 24 },
   footerControls: {
     paddingBottom: 40,
@@ -191,18 +199,18 @@ const styles = StyleSheet.create({
     width: '100%',
   },
   captureBtn: {
-    width: 76,
-    height: 70, // Un poco ovalado para que se note
-    borderRadius: 38,
+    width: 74,
+    height: 74,
+    borderRadius: 37,
     borderWidth: 5,
     borderColor: '#fff',
     justifyContent: 'center',
     alignItems: 'center',
   },
   captureInner: {
-    width: 54,
-    height: 54,
-    borderRadius: 27,
+    width: 56,
+    height: 56,
+    borderRadius: 28,
     backgroundColor: '#fff',
   },
   disabled: { opacity: 0.5 },
diff --git a/src/ui/MediaStrip.tsx b/src/ui/MediaStrip.tsx
index cc8f003..2fb710e 100644
--- a/src/ui/MediaStrip.tsx
+++ b/src/ui/MediaStrip.tsx
@@ -1,21 +1,26 @@
 /**
  * Tira de fotos de un registro. Muestra las ya sincronizadas (tabla `media`)
- * y las locales en cola (`media_outbox`). Permite añadir nuevas desde cámara
- * o galería; antes de encolarlas les estampa un pie de página georreferenciado
- * (logo + proyecto + fecha + coordenadas) capturado con react-native-view-shot.
+ * y las locales en cola (`media_outbox`). Permite añadir nuevas desde cámara;
+ * antes de encolarlas les estampa un pie de página georreferenciado.
  *
- * El pie de página es configurable desde PhotoSettingsScreen (icono ⚙).
+ * Mejoras:
+ * - Acceso directo a cámara.
+ * - Layout en cuadrícula (grid).
+ * - Selección múltiple para borrado masivo.
+ * - Visor de imagen integrado.
+ * - Procesado de sello en segundo plano (no bloquea).
  */
-import * as ImagePicker from 'expo-image-picker';
 import * as Location from 'expo-location';
 import React, { useCallback, useEffect, useRef, useState } from 'react';
 import {
   Alert,
   Image,
+  Modal,
   ScrollView,
   StyleSheet,
   Text,
   TouchableOpacity,
+  useWindowDimensions,
   View,
 } from 'react-native';
 import { captureRef } from 'react-native-view-shot';
@@ -23,7 +28,7 @@ import { useNavigation } from '@react-navigation/native';
 import { NativeStackNavigationProp } from '@react-navigation/native-stack';
 import { Media, MediaParentEntity } from '../api/types';
 import { absoluteUrl } from '../config';
-import { deleteMediaOutbox, enqueueMedia, getMediaOutboxFor, MediaOutboxRow } from '../db/outbox';
+import { deleteMediaOutbox, enqueueMedia, getMediaOutboxFor, MediaOutboxRow, updateMediaLocalUri } from '../db/outbox';
 import { getActiveProjectId, getMediaFor, getProject } from '../db/repositories';
 import { RootStackParamList } from '../navigation/types';
 import {
@@ -39,6 +44,7 @@ import { COLORS } from './components';
 // ─── tipos internos ────────────────────────────────────────────────────────
 
 interface ComposingTask {
+  uuid: string; // Para saber qué registro actualizar al terminar
   uri: string;
   renderW: number;
   renderH: number;
@@ -54,9 +60,7 @@ async function getCoords(): Promise<{ latitude: number; longitude: number } | nu
   try {
     const { granted } = await Location.requestForegroundPermissionsAsync();
     if (!granted) return null;
-    const loc = await Location.getCurrentPositionAsync({
-      accuracy: Location.Accuracy.Balanced,
-    });
+    const loc = await Location.getCurrentPositionAsync({ accuracy: Location.Accuracy.Balanced });
     return loc.coords;
   } catch {
     return null;
@@ -81,13 +85,20 @@ export function MediaStrip({
   canUpload: boolean;
 }) {
   const navigation = useNavigation<Nav>();
+  const { width: winW } = useWindowDimensions();
+
   const [synced, setSynced]   = useState<Media[]>([]);
   const [pending, setPending] = useState<MediaOutboxRow[]>([]);
   const [composing, setComposing] = useState<ComposingTask | null>(null);
 
+  // Estados para selección y visor
+  const [selectedUuids, setSelectedUuids] = useState<Set<string>>(new Set());
+  const [viewerUri, setViewerUri] = useState<string | null>(null);
+
   const captureViewRef = useRef<View>(null);
-  const resolveRef = useRef<((uri: string) => void) | null>(null);
-  const rejectRef  = useRef<((e: unknown) => void) | null>(null);
+
+  // Cola de tareas de procesado para no perder ninguna
+  const queueRef = useRef<ComposingTask[]>([]);
 
   // ── cargar datos ──────────────────────────────────────────────────────────
 
@@ -102,43 +113,51 @@ export function MediaStrip({
 
   useEffect(() => { void refresh(); }, [refresh]);
 
-  // ── compositing (ViewShot) ────────────────────────────────────────────────
+  // ── compositing (Procesado en 2º plano) ───────────────────────────────────
+
+  /** Inicia el siguiente procesado de la cola si no hay uno en curso. */
+  const processNext = useCallback(() => {
+    if (composing || queueRef.current.length === 0) return;
+    const next = queueRef.current.shift();
+    if (next) setComposing(next);
+  }, [composing]);
+
+  useEffect(() => {
+    processNext();
+  }, [composing, processNext]);
 
-  /** Llamado por Image.onLoad cuando la imagen del composer ya está dibujada. */
   const onCaptureImageLoaded = useCallback(() => {
-    // Un frame para que el layout nativo finalice antes de capturar.
+    if (!composing) return;
+
     setTimeout(async () => {
       if (!captureViewRef.current) {
-        rejectRef.current?.(new Error('captureRef is null'));
         setComposing(null);
         return;
       }
       try {
-        const uri = await captureRef(captureViewRef, { format: 'jpg', quality: 0.85 });
-        resolveRef.current?.(uri);
+        const stampedUri = await captureRef(captureViewRef, {
+          format: 'jpg',
+          quality: composing.config.quality
+        });
+        // Actualizar el registro local con la imagen ya sellada
+        await updateMediaLocalUri(composing.uuid, stampedUri);
+        await refresh();
       } catch (e) {
-        rejectRef.current?.(e);
+        console.error('Stamping failed:', e);
       } finally {
-        setComposing(null);
-        resolveRef.current = null;
-        rejectRef.current  = null;
+        setComposing(null); // Esto disparará el siguiente en la cola vía useEffect
       }
-    }, 80);
-  }, []);
+    }, 100);
+  }, [composing, refresh]);
 
-  /**
-   * Estampa el pie de página sobre `rawUri`.
-   * Si el footer está desactivado o vacío devuelve el URI original intacto.
-   */
-  async function stamp(rawUri: string, origW: number, origH: number): Promise<string> {
+  /** Prepara una tarea de estampado y la mete en la cola. */
+  async function scheduleStamp(uuid: string, rawUri: string, origW: number, origH: number) {
     const [config, projectId] = await Promise.all([
       loadFooterConfig(),
       getActiveProjectId(),
     ]);
 
-    const hasContent = config.enabled &&
-      (config.logoUri != null || config.fields.some((f) => f.enabled));
-    if (!hasContent) return rawUri;
+    if (!config.enabled) return;
 
     let projectName: string | null = null;
     if (projectId != null) {
@@ -158,145 +177,170 @@ export function MediaStrip({
 
     const targetW = RESOLUTION_WIDTHS[config.resolution] || 1920;
     const scale   = Math.min(1, targetW / origW);
-    const renderW = Math.round(origW * scale);
-    const renderH = Math.round(origH * scale);
 
-    return new Promise<string>((resolve, reject) => {
-      resolveRef.current = resolve;
-      rejectRef.current  = reject;
-      setComposing({ uri: rawUri, renderW, renderH, meta, config });
+    queueRef.current.push({
+      uuid,
+      uri: rawUri,
+      renderW: Math.round(origW * scale),
+      renderH: Math.round(origH * scale),
+      meta,
+      config,
     });
+    processNext();
   }
 
-  // ── captura de foto ───────────────────────────────────────────────────────
+  // ── acciones ──────────────────────────────────────────────────────────────
 
   const handleCapture = async (uri: string, width: number, height: number) => {
-    let finalUri: string;
-    try {
-      finalUri = await stamp(uri, width, height);
-    } catch {
-      finalUri = uri;
-    }
-
-    await enqueueMedia({
+    // 1. Guardar la imagen original inmediatamente para respuesta instantánea
+    const uuid = await enqueueMedia({
       parentEntity,
       parentId,
-      localUri: finalUri,
+      localUri: uri,
       mimeType: 'image/jpeg',
       category: 'image',
     });
-    await refresh();
-  };
 
-  const addFromLibrary = async () => {
-    const perm = await ImagePicker.requestMediaLibraryPermissionsAsync();
-    if (!perm.granted) {
-      Alert.alert('Permiso necesario', 'Concede el permiso para añadir fotos.');
-      return;
-    }
+    await refresh(); // Mostrar en la galería ya
 
-    const result = await ImagePicker.launchImageLibraryAsync({ quality: 0.85, mediaTypes: 'images' });
-    if (result.canceled || !result.assets?.length) return;
-
-    const asset = result.assets[0];
-    await handleCapture(asset.uri, asset.width ?? 1920, asset.height ?? 1080);
+    // 2. Programar el estampado en segundo plano
+    void scheduleStamp(uuid, uri, width, height);
   };
 
   const onAdd = useCallback(() => {
-    Alert.alert('Añadir foto', undefined, [
-      {
-        text: 'Cámara',
-        onPress: () => navigation.navigate('Camera', { onCapture: handleCapture })
-      },
-      { text: 'Galería', onPress: () => void addFromLibrary() },
-      { text: 'Cancelar', style: 'cancel' },
-    ]);
-  }, [navigation, handleCapture, addFromLibrary]);
+    navigation.navigate('Camera', { onCapture: handleCapture });
+  }, [navigation, handleCapture]);
 
-  const onDeletePending = useCallback(
-    async (m: MediaOutboxRow) => {
-      Alert.alert('Eliminar foto', '¿Deseas eliminar esta foto antes de sincronizar?', [
-        { text: 'Cancelar', style: 'cancel' },
-        {
-          text: 'Eliminar',
-          style: 'destructive',
-          onPress: async () => {
-            await deleteMediaOutbox(m.uuid);
-            await refresh();
-          },
+  const toggleSelect = (uuid: string) => {
+    setSelectedUuids((prev) => {
+      const next = new Set(prev);
+      if (next.has(uuid)) next.delete(uuid);
+      else next.add(uuid);
+      return next;
+    });
+  };
+
+  const deleteSelected = async () => {
+    const count = selectedUuids.size;
+    if (count === 0) return;
+
+    Alert.alert('Eliminar fotos', `¿Deseas eliminar las ${count} fotos seleccionadas?`, [
+      { text: 'Cancelar', style: 'cancel' },
+      {
+        text: 'Eliminar',
+        style: 'destructive',
+        onPress: async () => {
+          for (const uuid of selectedUuids) {
+            await deleteMediaOutbox(uuid);
+          }
+          setSelectedUuids(new Set());
+          await refresh();
         },
-      ]);
-    },
-    [refresh],
-  );
+      },
+    ]);
+  };
 
   // ─── render ───────────────────────────────────────────────────────────────
 
+  const isSelectionMode = selectedUuids.size > 0;
+  const thumbSize = (winW - 32 - 16) / 3;
+
   if (synced.length === 0 && pending.length === 0 && !canUpload) return null;
 
   return (
     <View style={styles.wrapper}>
-      {/* Cabecera con icono de configuración */}
-      {canUpload && (
-        <View style={styles.header}>
-          <Text style={styles.headerLabel}>Fotos</Text>
-          <TouchableOpacity onPress={() => navigation.navigate('PhotoSettings')}>
-            <Text style={styles.gear}>⚙</Text>
-          </TouchableOpacity>
+      <View style={styles.header}>
+        <Text style={styles.headerLabel}>
+          {isSelectionMode ? `${selectedUuids.size} seleccionadas` : `Fotos (${synced.length + pending.length})`}
+        </Text>
+        <View style={styles.headerActions}>
+          {isSelectionMode ? (
+            <TouchableOpacity onPress={deleteSelected} style={styles.deleteAction}>
+              <Text style={styles.deleteActionTxt}>Borrar</Text>
+            </TouchableOpacity>
+          ) : (
+            <TouchableOpacity onPress={() => navigation.navigate('PhotoSettings')}>
+              <Text style={styles.gear}>⚙</Text>
+            </TouchableOpacity>
+          )}
         </View>
-      )}
+      </View>
 
-      {/* Tira de miniaturas */}
-      <ScrollView
-        horizontal
-        showsHorizontalScrollIndicator={false}
-        contentContainerStyle={styles.row}
-      >
+      <View style={styles.grid}>
         {canUpload && (
-          <TouchableOpacity style={styles.addBtn} onPress={onAdd}>
+          <TouchableOpacity
+            style={[styles.addBtn, { width: thumbSize, height: thumbSize }]}
+            onPress={onAdd}
+            disabled={isSelectionMode}
+          >
             <Text style={styles.addPlus}>＋</Text>
-            <Text style={styles.addText}>Foto</Text>
+            <Text style={styles.addText}>Añadir</Text>
           </TouchableOpacity>
         )}
-        {pending.map((m) => (
-          <TouchableOpacity
-            key={m.uuid}
-            style={styles.thumbWrap}
-            onPress={() => onDeletePending(m)}
-            activeOpacity={0.8}
-          >
-            <Image source={{ uri: m.local_uri }} style={styles.thumb} />
-            <View
-              style={[
-                styles.tag,
-                { backgroundColor: m.status === 'error' ? COLORS.danger : COLORS.warn },
-              ]}
+
+        {pending.map((m) => {
+          const isSelected = selectedUuids.has(m.uuid);
+          const isProcessing = composing?.uuid === m.uuid || queueRef.current.some(q => q.uuid === m.uuid);
+
+          return (
+            <TouchableOpacity
+              key={m.uuid}
+              style={[styles.thumbWrap, { width: thumbSize, height: thumbSize }, isSelected && styles.selectedThumb]}
+              onPress={() => isSelectionMode ? toggleSelect(m.uuid) : setViewerUri(m.local_uri)}
+              onLongPress={() => toggleSelect(m.uuid)}
+              activeOpacity={0.8}
             >
-              <Text style={styles.tagText}>
-                {m.status === 'error' ? 'error' : 'en cola'}
-              </Text>
-            </View>
-            <View style={styles.deleteOverlay}>
-              <Text style={styles.deleteIcon}>✕</Text>
-            </View>
+              <Image source={{ uri: m.local_uri }} style={styles.thumb} />
+
+              {isProcessing && (
+                <View style={styles.processingOverlay}>
+                  <Text style={styles.processingTxt}>Sellando…</Text>
+                </View>
+              )}
+
+              {isSelected && (
+                <View style={styles.checkOverlay}>
+                  <Text style={styles.checkIcon}>✓</Text>
+                </View>
+              )}
+              {m.status === 'error' && (
+                <View style={[styles.tag, { backgroundColor: COLORS.danger }]}>
+                  <Text style={styles.tagText}>error</Text>
+                </View>
+              )}
+            </TouchableOpacity>
+          );
+        })}
+
+        {synced.map((m) => (
+          <TouchableOpacity
+            key={`s${m.id}`}
+            style={[styles.thumbWrap, { width: thumbSize, height: thumbSize }]}
+            onPress={() => setViewerUri(absoluteUrl(m.url))}
+          >
+            <Image source={{ uri: absoluteUrl(m.url) }} style={styles.thumb} />
           </TouchableOpacity>
         ))}
-        {synced.map((m) => (
-          <View key={`s${m.id}`} style={styles.thumbWrap}>
-            <Image source={{ uri: absoluteUrl(m.url) }} style={styles.thumb} />
-          </View>
-        ))}
-      </ScrollView>
+      </View>
 
-      {/* Vista fuera de pantalla para compositar el pie de página */}
-      {composing ? (
+      <Modal visible={!!viewerUri} transparent={false} animationType="fade">
+        <View style={styles.viewerContainer}>
+          <Image source={{ uri: viewerUri ?? undefined }} style={styles.viewerImg} resizeMode="contain" />
+          <TouchableOpacity style={styles.viewerClose} onPress={() => setViewerUri(null)}>
+            <Text style={styles.viewerCloseTxt}>Cerrar</Text>
+          </TouchableOpacity>
+        </View>
+      </Modal>
+
+      {/* COMPOSER OCULTO: Solo renderiza si hay una tarea en la cola */}
+      {composing && (
         <View
           ref={captureViewRef}
           collapsable={false}
           style={{
             position: 'absolute',
             top: 0,
-            left: -(composing.renderW + 100),
+            left: -(composing.renderW + 500),
             width: composing.renderW,
             height: composing.renderH,
             overflow: 'hidden',
@@ -304,55 +348,75 @@ export function MediaStrip({
         >
           <Image
             source={{ uri: composing.uri }}
-            style={StyleSheet.absoluteFill}
+            style={{ width: composing.renderW, height: composing.renderH }}
             resizeMode="stretch"
             onLoad={onCaptureImageLoaded}
           />
-          <FooterOverlay
-            config={composing.config}
-            meta={composing.meta}
-            imageWidth={composing.renderW}
-          />
+          <FooterOverlay config={composing.config} meta={composing.meta} imageWidth={composing.renderW} />
         </View>
-      ) : null}
+      )}
     </View>
   );
 }
 
-// ─── estilos ──────────────────────────────────────────────────────────────
-
 const styles = StyleSheet.create({
   wrapper: { marginVertical: 8 },
   header: {
     flexDirection: 'row',
     justifyContent: 'space-between',
     alignItems: 'center',
-    paddingHorizontal: 2,
-    marginBottom: 6,
+    paddingHorizontal: 4,
+    marginBottom: 10,
+  },
+  headerLabel: { fontSize: 14, fontWeight: '700', color: COLORS.muted },
+  headerActions: { flexDirection: 'row', alignItems: 'center' },
+  gear: { fontSize: 18, color: COLORS.muted, paddingHorizontal: 8 },
+  deleteAction: { backgroundColor: COLORS.danger, paddingHorizontal: 12, paddingVertical: 4, borderRadius: 6 },
+  deleteActionTxt: { color: '#fff', fontSize: 12, fontWeight: 'bold' },
+
+  grid: {
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    gap: 8,
   },
-  headerLabel: { fontSize: 13, fontWeight: '600', color: COLORS.muted },
-  gear: { fontSize: 18, color: COLORS.muted, paddingHorizontal: 4 },
-  row: { gap: 8, paddingRight: 8 },
   addBtn: {
-    width: 72,
-    height: 72,
     borderRadius: 8,
     borderWidth: 1,
     borderColor: COLORS.primary,
     borderStyle: 'dashed',
     justifyContent: 'center',
     alignItems: 'center',
+    backgroundColor: '#fff',
   },
-  addPlus: { color: COLORS.primary, fontSize: 22, fontWeight: '700' },
-  addText: { color: COLORS.primary, fontSize: 11 },
+  addPlus: { color: COLORS.primary, fontSize: 24, fontWeight: '700' },
+  addText: { color: COLORS.primary, fontSize: 11, marginTop: 2 },
+
   thumbWrap: {
-    width: 72,
-    height: 72,
     borderRadius: 8,
     overflow: 'hidden',
     backgroundColor: COLORS.bg,
+    borderWidth: 2,
+    borderColor: 'transparent',
   },
+  selectedThumb: { borderColor: COLORS.primary },
   thumb: { width: '100%', height: '100%' },
+
+  checkOverlay: {
+    ...StyleSheet.absoluteFillObject,
+    backgroundColor: 'rgba(31, 111, 67, 0.4)',
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  checkIcon: { color: '#fff', fontSize: 32, fontWeight: 'bold' },
+
+  processingOverlay: {
+    ...StyleSheet.absoluteFillObject,
+    backgroundColor: 'rgba(0,0,0,0.5)',
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  processingTxt: { color: '#fff', fontSize: 10, fontWeight: 'bold' },
+
   tag: {
     position: 'absolute',
     bottom: 0,
@@ -362,16 +426,18 @@ const styles = StyleSheet.create({
     alignItems: 'center',
   },
   tagText: { color: '#fff', fontSize: 9, fontWeight: '700' },
-  deleteOverlay: {
+
+  /* Visor */
+  viewerContainer: { flex: 1, backgroundColor: '#000', justifyContent: 'center' },
+  viewerImg: { width: '100%', height: '80%' },
+  viewerClose: {
     position: 'absolute',
-    top: 4,
-    right: 4,
-    backgroundColor: 'rgba(0,0,0,0.4)',
-    width: 20,
-    height: 20,
-    borderRadius: 10,
-    justifyContent: 'center',
-    alignItems: 'center',
+    bottom: 40,
+    alignSelf: 'center',
+    paddingHorizontal: 30,
+    paddingVertical: 12,
+    backgroundColor: 'rgba(255,255,255,0.2)',
+    borderRadius: 25,
   },
-  deleteIcon: { color: '#fff', fontSize: 12, fontWeight: 'bold' },
+  viewerCloseTxt: { color: '#fff', fontWeight: 'bold' },
 });