I have added an audio file that I want to put as background music for my video. Ever since I added the file, the software has become slow and glitchy. The two bars that indicate where I want the music to stop and start will not move (they are both positioned at the very end of the video.) Is this common? Does the software just need a rest? Should I restart my computer? There is loads of information online about how to add music to video on the photos app but everytime I click on my video in the photos app it just take me back to Video Editor!

Any advice would be appreciated, thank you.