diff --git a/src/pages/sign/index.tsx b/src/pages/sign/index.tsx
index 3b6836b..07c385e 100644
--- a/src/pages/sign/index.tsx
+++ b/src/pages/sign/index.tsx
@@ -724,9 +724,9 @@ export const SignPage = () => {
 
     zip.file('meta.json', stringifiedMeta)
 
-    Object.entries(files).forEach(([fileName, arrayBuffer]) => {
-      zip.file(`files/${fileName}`, arrayBuffer)
-    })
+    for (const [fileName, pdf] of Object.entries(files)) {
+      zip.file(`files/${fileName}`, await pdf.file.arrayBuffer())
+    }
 
     const arrayBuffer = await zip
       .generateAsync({
@@ -763,9 +763,9 @@ export const SignPage = () => {
 
     zip.file('meta.json', stringifiedMeta)
 
-    Object.entries(files).forEach(([fileName, arrayBuffer]) => {
-      zip.file(`files/${fileName}`, arrayBuffer)
-    })
+    for (const [fileName, pdf] of Object.entries(files)) {
+      zip.file(`files/${fileName}`, await pdf.file.arrayBuffer())
+    }
 
     const arrayBuffer = await zip
       .generateAsync({