I'm triying to create a shortcut for different actions in photoshop. My mouse have laterals buttons but I can't add it like a shortcut. Is there a way to create a shortcut for the mouse or it is imposible?.
I don't know the G203 specifically, but it is a gaming mouse and has programable buttons, although as far as I can see, only a couple of them. You need to install the Logitech G-Hub software. With that you can record macros to specific buttons, but the easiest way would be to asign keystrokes to each button. Use G-Hub to asign one of the Function keys to each gaming button, and then record short Actions in Photoshop that perform the task you want and trigger the Actions with the same F key asigned to the mouse buttons
These are the default Function key shortcuts in Photoshop. I suspect not many people use them, so you can reeasign them to more useful functions.