To grant or remove permissions to a file or folder within Nucleus, click on the Organisation and then click Documents
Locate and select the required folder/file you wish to make changes to. In this example we're using Important Documents.txt
Click the Share With Others button
Once you have selected the correct user, click the Share button. This will then share the item with that user and you'll see the list of other users that have access to the file.
You can then add more users by repeating the process. To finish the process click the at the the top right of the window.