Have you restarted the app?
If it’s still not working, do you use any clipboard manager tool or anything like that?
If not, we have to look into the clipboard data.
What do you get if you run the following code in the developer console, after copying a screenshot?
Note that your clipboard replaces the data when you copy the below code. Be sure that the clipboard has the screenshot data when running the code.
var clipboard = require('electron').clipboard
clipboard.availableFormats()
The expected output is:
