Android (Snapmaker too) has a developer mode.
On Snapmaker A350 screen this can be accessed by going into settings and then selecting the About machine.
Tap this 5 times on the machine picture and you can then enter Developer mode.
If you don’t mind, what options are available once developer mode is enabled? What is added under those two options. And can you disable developer mode once enabled?
Yea, the menu is only Chinese, there’s no way to switch to English since they didn’t even bother translating (there’s no English strings on the app).
I decompiled the app, and it seems it has an extra app in it that updates the main app when it gets a new version from the Internet, but I assume since it’s Android, it’s probably checking the signature of the app, so you’re not gonna be able to patch the app the machine runs.
You could try to build a copy of the app for another phone, and see if you could run the machine via a USB OTG connection, be t I heavily doubt that would work, and it’d be a lot of reverse engineering to even understand how the touchscreen<>machine protocol works.