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/da10c5c707c4b886ef151b55080562356b1f417e/spec/fixtures/files/mini-static.gif)