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/4ae97a2e4c4bea850c95a523e84e0424e7c18ffd/spec/fixtures/files/mini-static.gif)