Welcome to Android Central forums.
Just want to start off with a few questions so we can understand your issue better. Sorry if they seem basic.
Have you never tried to do this before? If you have what method did you use?
Does the file actually transfer at a lower resolution or does it just play at lower resolution?
Anyway, a quick Google turned up this answer and link to 14 other ways...
Use a USB cable to move files to a Mac
- Connect your phone and Mac with the USB cable.
- Select File transfer / Android Auto from the USB preferences notification or pop-up.
- Open the Android File Transfer app (if it doesn't open automatically).
- Browse your phone's contents and drag files to a Finder window to transfer.
Jul 22, 2023
15 quick ways to transfer files from your Android to a PC or Mac
Let us know how this works out for you.
Best wishes