Lightroom Classic: Can't load video files - can not connect to Dynamic Link

 Please give your computer the "once over"! Run Onyx (https://www.titanium-software.fr/en/onyx.html), reboot. Not fixed? Run Disk Warrior (https://www.alsoft.com), reboot. Also, try it from another (admin) account, as a test. Can you import from this other account into a new catalog? If you can, then maybe it's a preference in your yourusername/Library/ApplicationSupport/Adobe? Check The Lightroom Queen site (https://www.lightroomqueen.com)for instructions on how to reset your preferences, or, if that doesn't work you could try deleting that entire Adobe folder, or use App Cleaner to completely delete everything Adobe and reinstall it (Last Resort!)