I am an "Editor" (and have also tried this as "Co-Owner") as an external user on a share from a vendor. I am not able to make any changes to the share. (For example, the "New +" button is greyed out with the message "You do not have permission to upload or create items in this folder.") I am on a Mac and have tried this within the Box application/Finder, in Safari, and in Chrome.
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