fileName now take the upload code

src/routes/download.ts

@@ -2,7 +2,7 @@ import { lstat } from "node:fs/promises";
 import { hasValidAuth, renderPasswordForm } from "../auth";
 import { notFound } from "../http";
 import { log } from "../log";
-import { contentDisposition, fileIdFromKey, KEY_PATTERN, secretMatches } from "../security";
+import { contentDisposition, downloadFileName, fileIdFromKey, KEY_PATTERN, secretMatches } from "../security";
 import { isExpired, type Storage } from "../storage";
 
 export async function handleDownload(
@@ -41,7 +41,7 @@ export async function handleDownload(
   const headers = new Headers({
     "content-type": meta.mimeType || "application/octet-stream",
     "content-length": String(fileStat.size),
-    "content-disposition": contentDisposition(meta.originalName),
+    "content-disposition": contentDisposition(downloadFileName(rawKey, meta.originalName)),
     "cache-control": "private, no-store",
     "x-content-type-options": "nosniff",
     "referrer-policy": "no-referrer",