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
![](/potsda.mn/mastodon/raw/commit/e1227457f197f856764bdb27c61d527180f98862/spec/fixtures/files/mini-static.gif)