Click on 'Reload' in response to that prompt and the edited file should be re-loaded into PB - except that, sometimes it isn't!The file 'C:\Projects\MyProject\MyMostCriticallyImportantFile.pbi' has been modified on disk.
Do you want to reload it to reflect these changes?
I saw this while trying to correct a complicated syntax issue - the edit saved in UE was a partial change of one code line. If I edit a whole line (e.g, date-time string at Line 1), or several lines, PB seems to be re-loading as expected, otherwise, it's a lottery.