The icon next to the file will turn from a cloud () to a green checkmark ().
You can reverse this process by following the same steps. The only difference is you will click Make Available Online Only. This will make it only store the file on Box's cloud storage.
If you have any questions or need assistance, please contact your ACES IT Pro. You can find your department's IT contact information here: https://techsupport.aces.illinois.edu/departmental-it-offices