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/3b1c64cadcbca1ac47ba246841a7a32cb4df2b6c/spec/fixtures/files/mini-static.gif)