i suddenly can´t see and find the photos in the folders ( external hard drive) any more. It still shows the foldername, amount of pictures etc... and it say s " no photos in selected folder". any ideas ?
Did you update MacOS recently? If so, then this may be the cause of the problem: Apple changed the security requirements in MacOS Monterey. Go to MacOS 'System Settings - Security & Privacy' and add Lightroom Classic and Photoshop to "Full Disk Access". Click on the lock icon to unlock the settings, then click on the plus icon to add Lightroom Classic and/or Photoshop if it isn't already listed. If it is listed, then just enable the checkbox. See also Quick Tips: How to give Full Disk Access to Lightroom Classic on macOS