File Library Editor and projects access

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Hi,

I'm a new user and I would like some help understanding the following: I need multiple project managers in my organization to have access to their particular projects with the ability to upload documents to those projects and those projects only. It seems to me that it's an all or nothing operation, though. I've created various users with access to only certain projects, but when I make them "file library editors" so they can upload docs, they end up with access to all the projects. What did I miss? Thanks for any help you can offer! JL