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Remember that when you import a photo into your library, Lightroom adds the image file’s name and address to the library catalog file, and displays an entry for the folder in which the photo is stored in the Folders panel.
If you rename or move a photo—or a folder—while you’re outside the Lightroom workspace the link to the catalog will be broken and Lightroom may no longer be able to locate the image file.
Lightroom will alert you to the problem by marking the thumbnail of the missing photo—or the entry for the missing folder in the Folders panel—with a question mark icon.
1. In the Grid view, right-click / Control-click one of the photographs of Venetian Carnival masks and choose Show In Explorer / Show In Finder from the menu.