Sometime in the past months, Teamviewer began failing to be able to make a File Transfer connection in the case where the remote Windows targets does not have a user logged in. Before (I think) it worked.
The workaround which has been posted is to remotely login first ... but that's cumbersome in any case, and especially so from an Android/mobile client.
Proposal:
Since Windows is a multi-user operating system which can run different processes in different user contexts at the same time, Teamviewer should be able to set up a session as a determined Windows user - assuming that Windows user authentication is used - regardless of who/whether any user is presently logged in on the remote.
(I'm using Teamviewer 9.last on Windows and have seen this problem on Windows 7, 8 and 10, and Teamviewer Android as the client v10.0.2712 CL).
