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
![](/asonix/mastodon/raw/commit/83d3e7733da892f5ad94ed2b8757db11250fbe6a/spec/fixtures/files/mini-static.gif)