The path doesn't really matter, slash and backslash nither. I'm able to access any other file in the container that was created by this pipeline. I just don't know why the outcome of this pipeline is so random. Sometimes it passes with no problem, sometimes it just waits from 1 minute to several hours.
A successful run for a large amount of data:
A failed run for no particular reason:
The error message is misleading, I don't know if this is a problem on the CosmosDB or the Blob side. I added logging to the copy activity, but it doesn't show anything useful. Is there a place where I can find detailed logs from the pipeline runs?