With this button you can link previously registered files to a record. When you open the Link file... window, all the registered file paths are displayed in the folder Root to the left, and the registered files in each file path to the right of the window.
The system will now remember which folder you last used and this folder will then be suggested the next time you link a file.
If you want to enter new file paths, you must first do this in the Update Document Path procedure.