I pushed my first upload of a new game last night using butler (command: butler status bunbun-beep-boops/the-vital-size:windows-alpha) and it looked like everything was fine given that running butler status on it shows a happy little checkmark.

+---------------+----------+-----------+---------+
|    CHANNEL    |  UPLOAD  |   BUILD   | VERSION |
+---------------+----------+-----------+---------+
| windows-alpha | #1719247 | √ #202317 |       1 |
+---------------+----------+-----------+---------+

However, I was unable to download it via the itch.io app.  I got this error instead:" itch.io API error (400): /builds/202263: invalid upload"

I was able to download the zip file, extract it, and run the executable to play the game, so the error is probably not with the game but I'm not sure.  Any idea how to fix?

The API error is saying it’s having an issue trying to download a different file than the one you quoted from your butler upload. Perhaps the page hadn’t refreshed? Are you still experiencing an issue?

It was still happening for about 6 hours after the post, even if I closed and re-opened the Desktop app.  But sometime after that it started working without me doing anything to change it.