Looks like copied tempfile need to be flushed before further processing. This issue won't happen if the uploaded file has enough file size.
1.2 KiB
32x32px
1.2 KiB
32x32px
![](/vbatts/mastodon/raw/commit/3a4d994c40962a9abe45565a34e3d7a3ca1ccd49/spec/fixtures/files/mini-static.gif)