The instructions at https://help.dropbox.com/share/create-and-share-link are unclear. When I attempt to create a link to a folder where I have access exclusively, the only option available is to copy link, and it says in the window where the link is given that the folder I am granting access to will have editing access. I did this and can confirm I was able to add the folder to another dropbox and be able to add files to it.