Hi
I had a reply from a ticket i raised. The tech guy tested my question in the lab and confirmed we cannot do more than 1 share. it was possible to do no 1 then do no 2 but the Dropbox files were duplicated and then synced down again.
Bottom line is don’t do it as it is not suitable.
At least we know.
I have now piled all my data into a single share and synchronize the one share with Dropbox. job done.