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
![](/AkkomaGang/masto-fe/raw/commit/813da6788e5129579db04e89aac3076902af2c7a/spec/fixtures/files/mini-static.gif)