From Desktop To iPhone, Can't See iPhone Photos In Thumbnails

Maybe I missed the post in my search for anwwers.

I have been using Teamviewer for long now, but just tried with my iPhone 9, iOS11.  I can connect my phone to my computer (Dell Desktop) or vice vasa.  My problem is how to transfer files from my phone to my computer.

From the desktop, connected to the phone, found the file/folder.  However, on the phone, the photos are shown as file names and not thumbmails so I don't know which photo is which to select.  Is there a setting for this?

Thanks