@NikonNut can you just confirm for clarity what you mean when using 'Dropbox'. For me there are at least three meanings:
- The public cloud service Dropbox that synchronises access to and copies of files across client devices and maintains versions at the central server.
- The old Apple Mac home account folder ~/Public/Drop Box that allowed other users to write to this folder and so share files.
- The concept of a 'drop-box' when people can leave useful stuff.
- Don't look in Urban Dictionary unless you are very broadminded cos I didn't know most of those other meanings

Cloud Station Server and Synology Drive cannot be installed on the NAS at the same time, it's an either/or situation.
Drive has taken over from Cloud Station though their respective client apps will work with either server package. Where desktop clients for Cloud Station were split into two (one for computer backup and the other for 'Dropbox-like' folder sync) with Drive there is one desktop client that combines the activities of the previous two.
With Drive client you can backup (using the client's Backup task) multiple computers to the same NAS user account and each computer will be using its own folder within 'home/Drive/Backup': my Mac Mini and MacBook Air both backup to their own folders at this location.
Using Drive client's Sync task you can define as many tasks as you want to your home/Drive ('My Drive') folder and accessible Team Folders. Team Folders are NAS Shared Folders that you've enabled access to within Drive Admin Console: user access is determined by the privileges granted to the Shared Folder in Control Panel. You could create a new Shared Folder 'File Transfer' and grant read/write access to your users, then enable it as a Team Folder. Finally you'd create a two-way Sync-task in both computers using Drive client. If it's just for quick transfer of files then you can disable versions for the Team Folder.