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
![](/vbatts/mastodon/raw/commit/c36262c914ba28a9d65511e8e438f8cc85e59dc2/spec/fixtures/files/mini-static.gif)