Need more explanations on Zoho Dos standard plan

Need more explanations on Zoho Dos standard plan

Currently my org have 10 users. All use less than 5% of their storage, except me. My Zoho Docs account complains " Storage Space Exceeds "

Since other users don't use Docs very much, it makes perfect sense for me to upgrade my account only.
AKA. 1 paid users + 9 free users

My questions are:
1. Can I just make my account a Standard user and keep the other 9 Free users?
2. Is the 50GB storage shared among all 10 users or only for the Standard User, and others 9 still have the 1GB limit?