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
![](/dark-firepit/mastodon/raw/commit/f055907857dd0ecf7b1780b4ec770c0073de7466/spec/fixtures/files/mini-static.gif)