I have access to a brand account with 1 TB of storage. My Google Drive is basic and has 15 GB and is almost over-quota. When I try to upload a file to the shared drive, I get "Not enough storage quota to upload. Upgrade Storage." This thread explains:
If you are uploading the file, you are the owner and the storage counts against your quota. There is no way to upload files to someone else's Drive space or to transfer ownership to someone else in consumer (private) Google accounts. (There are some other options with G Suite accounts.)
I could not find if a brand account counts as a G Suite account, nor could I find a way to sign in to the brand account other than through my Google account.
How can I upload a file to a Google Brand Account without it counting on my storage?