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/b2051a6256df203fc11a9a6f7d0f8f46ccfae06e/spec/fixtures/files/mini-static.gif)