I have access to a folder on Dropbox that I am not the owner of but that I do have admin privileges to. I need to invite someone to that folder, however, they have an individual account and the folder I want to invite them to is a business account. I invited them once and they lost access to their folders. How do I invite them in such a way that they don't lose access to their individual account while being able to access everything in the folder that I want them to access?