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/cfd7b7a0b7f97a822cb80de8cbd4e33a07065cc7/spec/fixtures/files/mini-static.gif)