I imported a map into ArcPro that I created using ArcGIS Desktop several years ago. The layers showed up in the Contents Pane, but with red !. I tried to set the data source for the .lyr file, but when I go to where the file is located, it says "This container is empty" and the only option is (Poly Feature Class (All Types). How do I get these layer files to work in ArcPro.