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File failed to copy due to reason: Success
(sh.itjust.works)
The real reason was a boring one and seemingly unrelated to that file. I just ran out of disk space. Still though, that’s not exactly a helpful error is it
In C/C++, it's very common for a function to return an integer corresponding to any errors that occured within the function, including a "success" error code, because it has to return something, otherwise it's undefined.
I'm not sure that's what happened here but that's why "successful" errors are a thing. Somewhere it got misinterpreted maybe.