The alt key does not appear to work on android, ios, and probably chromeos. This means that you cannot bind any action to alt and also the copy coordinate shortcut does not work.
How to reproduce:
Go to keybinds on android or iOS
Try to set one to alt
Observed results:
The alt key is not recognized
Expected results:
The keybind should be set to "ALTERNATIVE"
Other notes:
The alt key is recognized on windows.
Other keys work fine on android
Can confirm. Although on iOS it's 'Option' instead of 'Alt'