Can't Import Videos into Harmony

I’m trying to import .mov videos into my project to use as reference, but Harmony just doesn’t do anything once I select the video I want to import. It just goes back to the program like nothing happened.

Do you have Quicktime installed on your computer?

I didn’t have it, but I installed it and it was fine. Quicktime 7.7 refused to install on my Windows 10 machine, so I had to use version 7.6