There are various stylus pen in android tablet(Especially, Galaxy tab)
And I'm using staedler noris digital.
There is a eraser in my pen's back. and it's available in Goodnotes well.
I highly like it.
But whenever I use this noris pen in samsung notes, after I've done using eraser, it's automaically going back to pen side.(I mean in the app)
So if it's possible in goodnotes, it would be very useful for user who has the other stylus pens.(Plus Spen! after using eraser by side button)