After Marshmallow update, I can no longer trim video, how can I fix this?

[AC Question]

I am using an HTC One M9, when the Marshmallow update was downloading, it locked up and I had to restart the phone, then it continued. However, I think this might have been the problem, because we have another of the same type of phone that got the update and works fine. Can I uninstall and reinstall the update?