The ‘Re-scan File Info' button is found in the Files panel and re-reads file tags for the entire library. Use this function if you have edited or modified file tags in other software. To rescan files in files in your library, you can either click the ‘Re-scan File Info’ button or click and drag a selection of files of the button.
TIP: Rescanning the tags is a handy way to identify any files that can’t be found, for example, if the files have been re-named or moved. These tracks are then shown as orange in the library pane, with a question mark icon in the status column.