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/50491e0d92acea90e7a83d2ab0e9a1b271daa8a8/spec/fixtures/files/mini-static.gif)