Photos and videos locked on my MacBook Pro M4

Are these photo files or photo library all owned by your Mac user, and is DaVinci Resolve set up for full disk access?

For the latter, look in System Settings > Security & Privacy > Privacy

Change Privacy & Security settings on Mac - Apple Support

Are you using RAW files? Not all RAW files are supported, and I didn't see your's on the list. Check this:

Digital camera RAW formats supported by iOS 18, iPadOS 18, macOS Sequoia, and visionOS 2 - Apple Support

Look at how many just Sony cameras are on this list! Every camera model and sub-model has its very own RAW format that's different from all the others. Apple doesn't seem interested in writing new code to support them all, and I find it hard to blame them for that. It makes you wonder why Sony (or Nikon, or ...) can't come up with a single format for all their cameras. I know that Nikon has its own NX Studio program for its files, and I imagine that Sony has an app that you can use.

You can use Adobe's free Digital Negative (DNG) converter to make a universally acceptable RAW picture file. This is the format that Lightroom uses when it creates a new (edited) RAW file, and Apple and Photos supports it. 

Check with DaVinci Resolve support.

That looks more like an icon styling choice, not a classic prohibition 🚫 symbol.

PS: Take a screenshot on Mac - Apple Support

Ahh-- this is the Users' Community for Apple's Photos app. As MrHoffman has said, you would need the " DaVinci resolve" people.