I have a Macbook Pro (Retina, 13-inch, early 2015 build) and its running Monterey 12.7.1. I want to use my photolibrary (titled MAIN.photolibrary) that is stored on an external hard drive. When I get that hard drive onto the folder section of the screensaver page and open the file...the photolibrary and imovie folders are not available (greyed out). Help please.