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/eb97bd8af6c9a06a52cc8b12d05ac9ea1aa5370a/spec/fixtures/files/mini-static.gif)