I've been tasked with deploying a rolled-up solution, and this thing is massive. When successfully deployed in our lower environments, the Import took 70 minutes, and the uninstall took just short of 3 hours (Uninstalling 16 months worth of patches deployed every 3 weeks).
I've now had the import just fizzle out twice. The standard practice is to use the legacy import option via Advanced Settings > Solutions, and we do an Upgrade/Overwrite. On these two occasions, when the import is nearly complete, the green progress bar goes back to being empty, and then.... nothing. No failure. No error. No success. Just nothing.
I've discovered that I am able to restart the import (this time via make.powerapps.com) after waiting a sufficient period to insure the import is truly hung up.
But I want to know, why does it hang? If it's a timeout or something, why don't I get a failure?