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src/util/generateDocumentThumb.js

@@ -9,7 +9,10 @@ const THUMB_MAX = 200;
  * @returns {Promise<Buffer>}
  */
 async function renderPdfPageToPng(pdfBuffer) {
-  const images = await pdfToPng(pdfBuffer, { dpi: 150, singleFile: true });
+  // The WASM converter may transfer (and detach) its input ArrayBuffer. Give it
+  // an isolated copy so the upload buffer remains usable by SQL and logging.
+  const pdfBytes = new Uint8Array(pdfBuffer);
+  const images = await pdfToPng(pdfBytes, { dpi: 150, singleFile: true });
   if (!images || images.length === 0 || !images[0].data) {
     throw new Error('pdfconvert-wasm produced no image output');
   }