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Please allow pairing of more than two accounts. As a contractor, I am a member of a company's business account, a team member of another company, and have my personal account. It is frustrating to on...
Stop deluding yourself, they are not going to do this because they either cant or don't want to.
And as for how hard it is, It would be piss easy, multiple copies of dropbox can run now to cover multiple accounts you just have to sign them in with different user profiles, so just a case of managing the source data into one account.