When I attempt to upgrade from inside the Confluence 'Manage apps' menu, the following error is displayed below the Atlassian Universal Plugin Manager Plugin;
'An error was encountered while updating the UPM. See the logs for more details.'
I have a log pulled from the issue, but I am uncertain what to decipher from it;
As this is an Atlassian plugin throwing the error, I am hopeful that a resolution will be found, relatively quickly, and I will do my best to get additional information as requested.