filetransfer over 2 teamviewer accounts

Í have 1 support pc - between 4 production pc, and connections from outside the house.

This setup is because of safety/security.

Only problem is filetransfer!  From outside you have to transfer your file to the support PC - and from the support pc - to the production pc? (and of course the other way around - same problem).

Is there a easier way around this ?

thanks jha