Thanks @besugophoto,
I thought I had suggested trying Amazon’s client for these since they can make use of the, as of yet, unreleased “resume upload” API. In these types of cases, the file makes it up, but Amazon says it doesn’t. With a resume upload API we could ask it to resume and it should push it through. I believe this is what Amazon’s client does… just wish they would make that API available to us, or fix this false error situation.
Edit
Ahh, I see. It was in a different thread. Apologies for not making the same recommendation here: