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/50b9276330e38657d3a4f596db29f78ac242eaf7/spec/fixtures/files/mini-static.gif)