How do I view how many units and file storage I have used?
You wouldn't need to carry around a physical storage device or use the same computer to save and retrieve your information. Under the main "Settings" → "File Manager" you'll find the information about your current subscription plan along with storage which should give you a fair estimate on how much storage space you've used and how much is remaining:
To create more storage, you can remove some of your items or upgrade your plan to increase your file storage limit.
This may be useful:
How to manage all uploaded files?
Sept. 27, 2021