Selecting images in Photos app from Media Browser

Having an odd problem. When I try to upload images from the Photos App to a website via the media browser the photos appear in the media browser window but I cannot select any of them. I end up exporting the images I need and then uploading them directly from by downloads folder. Not sure what the problem happens to be. Any thoughts? I am running a 15" MacBook Pro (2017), Catalina, and my Photos library is stored on an external drive with a USB C connection.