Also reproducible on latest beta

desktop/package.json

@@ -39,7 +39,7 @@
         "@typescript-eslint/eslint-plugin": "^7",
         "@typescript-eslint/parser": "^7",
         "concurrently": "^8",
-        "electron": "^29",
+        "electron": "30.0.0-beta.8",
         "electron-builder": "^24",
         "electron-builder-notarize": "^1.5",
         "eslint": "^8",

desktop/yarn.lock

@@ -1214,10 +1214,10 @@ electron-updater@^6.1:
     semver "^7.3.8"
     tiny-typed-emitter "^2.1.0"
 
-electron@^29:
-  version "29.3.0"
-  resolved "https://registry.yarnpkg.com/electron/-/electron-29.3.0.tgz#8e65cb08e9c0952c66d3196e1b5c811c43b8c5b0"
-  integrity sha512-ZxFKm0/v48GSoBuO3DdnMlCYXefEUKUHLMsKxyXY4nZGgzbBKpF/X8haZa2paNj23CLfsCKBOtfc2vsEQiOOsA==
+electron@30.0.0-beta.8:
+  version "30.0.0-beta.8"
+  resolved "https://registry.yarnpkg.com/electron/-/electron-30.0.0-beta.8.tgz#c4430b9cb662ec147709deaededefe6d7dcc0522"
+  integrity sha512-G2IMMxUVJopiskD5G5iCQh71u1Emp+Q7nS1bWRU/9sK8bKwW1qtyBb3qoq0X9bd7y0LuKUb79AOr3Ix+J6EKaQ==
   dependencies:
     "@electron/get" "^2.0.0"
     "@types/node" "^20.9.0"

web/apps/photos/src/utils/native-stream.ts

@@ -15,7 +15,35 @@
  * @param stream The stream which should be written into the file.
  *  */
 export const writeStream = async (path: string, stream: ReadableStream) => {
+    // return writeStreamOneShot(path, stream)
 
+    // The duplex parameter needs to be set to 'half' when streaming requests.
+    //
+    // Currently browsers, and specifically in our case, since this code runs
+    // only within our desktop (Electron) app, Chromium, don't support 'full'
+    // duplex mode (i.e. streaming both the request and the response).
+    // https://developer.chrome.com/docs/capabilities/web-apis/fetch-streaming-requests
+    const req = new Request(`stream://write${path}`, {
+        // GET can't have a body
+        method: "POST",
+        headers: { "Content-Type": "application/octet-stream" },
+        body: stream,
+        // @ts-expect-error TypeScript's libdom.d.ts does not include the
+        // "duplex" parameter, e.g. see
+        // https://github.com/node-fetch/node-fetch/issues/1769.
+        duplex: "half",
+    });
+    const res = await fetch(req);
+    if (!res.ok)
+        throw new Error(
+            `Failed to write stream to ${path}: HTTP ${res.status}`,
+        );
+};
+
+export const writeStreamOneShot = async (
+    path: string,
+    stream: ReadableStream,
+) => {
     const response = new Response(stream);
     const blob = await response.blob();
     // const ReadableStream()