Upload sketch, error. Boardtype is not available in the default list

Other Hardware 3rd Party Boards
1

i am trying OTG USB connection to arduino. What if the board type is not in the list of Board type available in ArduinoDroid app ? How to add BoardType to the list? so that my sketch could be Uploaded
Mega 2560 R3

2

You would have to ask the "ArduinoDroid" app people on thier forum as it is not an official Arduino application.