wrong file size in browser progress dialogue

• I have already searched the issue queue for my error message or symptom

Details about your operating system

Operating system: OnionShare on Windows 10 22H2, Tor Browser on macOS 15.5

Version of Onionshare: 2.6.3

How did you install OnionShare

• Native Windows package (*.msi) downloaded from onionshare.org download page

What is the problem

~943MiB (989698958B) file screenrecording.mov shared via OnionShare on Windows.

Entered URL (and key) into Onion Browser on macOS, clicked on download on the onionshare web page.

Transfer started, 602MB (IIRC) to transfer displayed in download progress dialogue of the tor browser.

After it reached 602MB it continued to download until all of the 943MiB were downloaded successfully.

It looks to me like a wrong content-length http header was sent to the browser, so it based the download progress on a wrong file size.