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 of 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?

Last updated:
Feb. 27, 2023