What happens to my subscription if I join a Dropbox team with an existing Dropbox account?
If you upgrade or transfer from Dropbox Plus or Professional to Dropbox Standard, Advanced, or Enterprise, your Plus or Professional subscription will immediately end. Any remaining credit on the Plus or Professional subscription will be refunded to the original payment method. Each individual Dropbox account owner can track this information on the account payments page.
If the automatic refund does not go through for any reason (such as an expired credit card), we'll notify the account owner by email.