Fixed downloading buffer, merging workflow

public/functions/mergePDFs.js

@@ -0,0 +1,15 @@
+const { PDFDocument, ParseSpeeds } = PDFLib;
+
+export const mergePDFs = async (snapshots) => {
+
+    const mergedPdf = await PDFDocument.create(); 
+
+    for (let i = 0; i < snapshots.length; i++) {
+        const pdfToMerge = await PDFDocument.load(snapshots[i]);
+
+        const copiedPages = await mergedPdf.copyPages(pdfToMerge, pdfToMerge.getPageIndices());
+        copiedPages.forEach((page) => mergedPdf.addPage(page));
+    }
+
+    return mergedPdf.save();
+};