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/c04c3e98e3eb333f38547c5ab16eeddc10423a93/spec/fixtures/files/mini-static.gif)