On the most recent attempt, the upload timed out after 75112160 bytes. I’m seeing roughly 8KB buffer fills by tokio::io::copy now, and that seems to make no difference.
I’m out of ideas at this point.
It’s been suggested to me by one of the tokio devs that I have a look at what’s happening in tokio-console while a problematic upload is happening. This will require coordinating so that I can be around to do this at the same time as someone having the problem.
When are people available?