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/6b880913d48fa4cf50de3228002f7f8b39b0b382/spec/fixtures/files/mini-static.gif)