Copy and paste an image from a presentation on one computer to a presentation on another

Copy and pasting using Logitech Flow depend on the applications. If it's a standard file format, such as JPG or PNG, you should be able to copy an image from a presentation on computer A to a presentation on computer B.

When you copy and paste content using Flow the image will be transferred over your network to the clipboard on the other computer. 

If the application that's receiving the image supports that file format you should be able to paste it.