[aopenshaw]

MobileSheets will always use the storage location for all of the files (it is listed under Settings->Storage->Set the MobileSheets Storage Location). Even if you import from Dropbox, the files are copied to the storage folder. If you use the Sync Library feature with a cloud folder, do not try to copy or move any files into the sync folder that you select - MobileSheets must be in charge of that folder and you should not try to modify it in any way. Just select an empty folder and then sync to it and MobileSheets will upload the library. 

As far as the follow up question, each device will have their own separate local storage folder, and you will sync to a common Dropbox folder. Sync is not automatic at the moment - that is something I want to add early next year, but it will have fewer settings/options, as it will be an "all or nothing" kind of sync.

Mike

So just to make sure, I should select a local storage folder for the PC and the tablet each and then create a common empty folder on dropbox to sync to?