To import a file from another DigiBase browser into the current session, you must drag files to the Timeline or Clip List. You cannot import a file into a session by dragging it to the Project browser. (You can, however, spot files from the Project browser into the current session using drag/drop.)
Deleting items in the Workspace browser or in Volume browsers deletes the files from disk. Video and session files cannot be deleted in the Project browser.
Deleting an item from the Project browser lets you remove items from the current session, or delete them from disk (using the Pro Tools Clear Clips dialog).
In the Project browser, the Copy and Relink command (in the Browser menu) cannot be used on session files, or on offline audio files. Use the Relink window to first bring items online. In addition, the
Relink Selected command cannot be used on session files.
The Project browser is automatically updated whenever a file is added to or deleted from the session, so it is always fully indexed and up to date.