It has been observed that all UWP Apps will crash when the user tries to save a file which will overwrite the existing one, the APP will crash, the only alternative solution is that the user will need to manually delete the existing file and then save a new file in the UWP application.
The application will NOT crash if DLP agent is disabled.
The issue will occur on both the 15.7 and 15.8 agents, it should be be reproducible in 16.0 and later.
A latest HF build of the 15.8 MP3 agent will resolve this issue and the issue should not be reproducible in 16.0 and later.