Windows 10: Cannot Trim Videos in Photo App for Windows 11

The option to trim videos is greyed out for me when I want to trim videos. I save replays from nVidia GeForce and when I go and try to trim, it doesn't let me.I tried to reset the app and even used the legacy app, but that brings another issue with horrible frame rate and stuttering audio like it's lagging.Image of the greyed out icon

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Photos app - trim a video - error

Hello,
I am trying to use the built-in Windows 10 Photos app to trim a video.
I have the video playing in the Photos app and click "Trim Video" at the top.
I move the sliders to select the start and end points.
I click "Save a copy" at top-right.
The app says "It looks as though you don't have permissions to save changes to this file. Try saving a copy instead."
Having just clicked "Save a copy", I am confused as to why this error message is appearing.
I've tried copying the .mp4 to my VIDEOS folder on C: drive with the same result.
Some research has suggested to run the Photos app as Administrator, but I can't figure out how to do that.
Any suggestions on how to trim a video would be appreciated!
Thanks,

 

Cannot save trimmed videos using the Photos App

I have a couple videos that I want to trim down in the Photos App; however, every time I attempt to trim the video, Photos would crash. After crashing, a trimmed file of the video would show up, but I cannot view the new clip.

 

permission to trim video clip

I uploaded a .mp4 file to my Windows 11 computer and I can play it by opening it in either Video or Photos but I would have to use Photos to edit (trim) it, but when I try it says I can't edit the file, and it also says I don't have permission to edit the file. Is there any other way to trim a video without buying a video editing app or program? Why does it have the trim option if I can't use it to trim my own video? Thanks for any help!