I had the same issue when I needed two dropbox accounts on one computer https://mac.eltima.com/transfer-files-between-2-dropbox-accounts/ for different projects. Shared folders worked, but they were too limiting for bigger transfers. It let me mount each Dropbox account like a virtual drive, and after that, drag-and-drop transfers felt exactly like moving files between regular folders. No syncing delays, no messy downloads — just straightforward movement between the two accounts.