Hello @var53_,
Happy to see your first post in TeamViewer Community!
To upload desktop images, you can use the file transfer feature of TeamViewer. There are 2 ways you can set up the file transfer:
First one would be from the toolbar actions when you are in a remote session. Here, explained in our Knowledge Base article, under Files & Extras, you can see how to transfer files within a remote session.
The second way to do so, would be to select Set up remote access on this device button when you are in your Devices. In our Open a file transfer session page, we guide you through these steps, and there is also a video tutorial!
Does one of these work for you? Please let us know.
Happy connecting!
Elif