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/c6b291afc3f6afe9b1c5df5808e9a5b40a4e06ce/spec/fixtures/files/mini-static.gif)