To Archive Files:
Select Files in the vertical menu
Click on the name of the file you'd like to archive
From this file preview screen, click the archive icon in the top right corner of the screen, just next to the Copy Link button.
To Unarchive Files:
Select Files in the vertical menu
Switch your Filter by setting from Active to Archived to see all archived files
Click on the name of the file you'd like to unarchive
From this file preview screen, click the unarchive icon in the top right corner of the screen, just next to the Copy Link button.
Files can only be archived or unarchived one at a time.