It's now in a state where it can actually upload ... something (that should work). Not tested the restore yet.
I did run into trouble with the max concurrent requests, which I had to up to [more than 4, now on 8] to get it to work -- I'm not sure if I'm just working around a bug here, or if that's expected behaviour.
part of CURA-12156
There could be an environment error when saving that file because of access rights or insufficient disk space. Catch that error and display an error message to the user. The log then contains more information on exactly why it failed, but the user just knows it fails.
Fixes Sentry issue CURA-21W.
