Okay, I have an idea -- I will just send you some screenshots because I have no idea what's going on... 😕 You might be able to see what's happening a bit easier then 😉
Screenshot 1:
I dragged in the icon below (above 'App Icon') from Finder. It is 128x128 and has .icns at the end!
Screenshot 2:
When I dragged the image from Finder to the box above 'App Icon' it automatically made it appear to the left of the window...
Screenshot 3:
I clicked on the project (to the left of the window), then clicked Build Phases and opened the Copy Bundle Resources section, however my image was not there...
Screenshot 4:
I then addded it by dragging it from the left of the window... (Was that a mistake?)
Screenshot 5:
I then dragged the Application under the Products section to the left of the window into my 'Applications' folder on my computer...
(As you can see, it doesn't have the correct icon...)
Screenshot 6:I right clicked on my Text to Speech application in the 'Applications' folder, and clicked 'Show package contents'. All that was there was a Contents folder, so I opened that. I then got this...
Screenshot 7:
I then opened the Resources folder, because I thought that was the most likely place for the image to be...
The strange thing was, the icon file you see there (GOOD ICON.icns) is an icon I had PREVIOUSLY been using, but not the one I had been using just then!
So, sorry for the long message, but I just thought I should try to explain in lots of detail because I am REALLY stuck with this!! 😟