Good day Tedfromks,
A few things that would be helpful to know about the videos you’re saving to the Photos app.
1. What is the origin of the videos? For example, did you record them using your iPad or Mac, etc?
2. Are you editing the videos before saving them to the Photos app?
3. Do you use iCloud Photos to sync videos between devices? Here’s how to check:
• iPadOS - Settings > your name > iCloud > Photos
• macOS - System Preferences > Apple ID > iCloud
On your Mac, let’s try playing in another app and see if there is any change. If an audio or video file doesn't play on Mac
How to search for an app that works with your file
You might already have an app that supports the format of your file. If you don't know which of your installed apps to try, your Mac might be able to suggest one:
1. Control-click (or right-click) the file in the Finder.
2. From the shortcut menu that opens, choose Open With. You should see a submenu listing all of the other installed apps that your Mac thinks might be able to open the file.
If none of your installed apps can open the file, search the Internet or Mac App Store for apps that can play or convert the file:
• Include the name of the media format in your search. To find the format, select the file and press Command-I to open an Info window. The format might appear after the label Kind, such as ”Kind: Matroska Video File.”
• Include the filename extension in your search. The extension is the letters shown at the end of the file's name, such as .avi, .wmv, or .mkv.
Thanks.