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/c8ed5dad7ca589d27b3c37121f07f9c17b4efce2/spec/fixtures/files/mini-static.gif)