The board of my housing cooperative (which I am a member of) is currently using a Dropbox Basic plan for our documents. We're nearing the 2GB limit. I think one of us created an account using the cooperative e-mail and invited the members to the folder where we store the documents My question is, is it sufficient to upgrade the owner's account to Plus. Or do every user need to upgrade our plans to Plus? Reason why I'm asking is that all members now receive the warning that space is running out, even though the files are not in our accounts (just shared with us).