Aravisian already suggested I try this and it won't play even in Xorg.
Can you please check if you can play videos in apps that are Zorin packages, e.g. a browser. So you can find out if it is a flatpak or permissions problem or a problem of graphics drivers. And you can find out if it is never playing videos or only not in this specific program.
First open the system monitor and kill the all the process(es) of MPV (if any)
Then try to launch the mpv again from the main menu. Wait for 5-10secs and then run the following command in terminal and share the output:
cat ~/.xsession-errors
I hope it give any clue related to the issue.
Another option could be to install ffmpeg.
I don't have any issues with any other video players or browsers, only MPV
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The output says no such file or directory
Actually, it is a .deb package, too... But evidently, not available in the Zorin Repos as one...
I installed that long ago. It only stopped working after upgrading to Z17.
I know you need MPV as flatpak... But would you be willing to install and test the apt .deb package of MPV just to see if it works?
That would clear up whether codecs are needed and narrow down the issue.
Okay, did this. It does work, tho when it opens it is tiny, like so small I need to put on glass to see the icons to click full screen. Played the video perfectly. No issues.
Is it possible to install older/previous versions of Flatpak MPV? Looks like they recently released this newest version which isn't working for me. Was thinking perhaps an older version would do the trick.
MPV is OpenGL, I believe, so it will not respond to HiDPI scaling unless explicitly given the means to do so.
This depends on how quickly the maintainer removes older versions... but we can try:
flatpak remote-info --log flathub io.mpv.Mpv
The above command should list out a series of commits. We can try picking an earlier commit, then install it with the hash.
That install command would look like (This is a Sample, not a real commit hash):
flatpak update --commit=9f0e1d23456789abcdef0123456789abcdef1234 io.mpv.Mpv
Bingo! This worked! I installed a commit from 8 months ago and voila, it's working beautifully!
Thank you Aravisian and everyone who offered their help. I truly appreciate your time 
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There exists a .deb Package? On the github Page, I see only the Info to get it from Flathub or built it by Yourself - and when I see it right, when You built it by Yourself, it will built a Flatpak, too.
And because we are on flatpaks: I take again a Look at the MPV Flatpak Version. It doesn't have a Verified Mark. So, it could be from a third-party Person. Maybe there didn't worked something to pack it?
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Aha, interesting. When Debian Trixie will be released, I will take a Look if it is wandered in the stable Trixie Repos. Thank You for the Info.
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