[abescalamis]

I understand better how the "keep existing" works now, thank you, I need to find a different way to do what I want.

"Keep Existing" option is not very helpful without being able to read different names other than the ones set in "Settings => Files & Sources => File Naming". 

I would like to suggest something like in the picture, but I don't know if it is possible, this will go perfectly along for the future releases of EMM since you mentioned that it will be able to remove/cleanup images not enabled in "Settings => Files & Sources => File Naming"