When trying to upgrade from the Business Standard to Business Plus plan, Google will reduce your workspace storage from 2TB/user to 0 bytes for up to 24 hours while it upgrades you.

These are actual quotes from support:

> Upon checking, I see that the storage is showing as 0 bytes, because of the upgrade that has been done from business standard to business plus. Not to worry as this is very normal.

> I understand your concern and how important it is for the storage to be updated due to the business requirements. > > To give you full transparency into what is happening: when a Workspace subscription is upgraded, our backend systems must first detach your previous Business Standard storage allocation before provisioning the new Business Plus limits. During this transition window, the quota temporarily defaults to zero.

> Now please turn ON user storage limit nor shared drive storage limit. Once you turn ON, please wait for 5 minutes and then please turn it OFF.

^ That last attempt to try to force storage quotas to reset faster didn't work, btw. Still took hours.