two midi issues - midi not recognized and the other no mapping (Koala)

Hi I am trying plytronical with two devices. A: Samsung p600 tablet - the midi is just not recognized (but a hacker changed the firmware so maybe this is a hardware problem) B. My Pixel 7 pro recognizes my touch, but when i map koala to different sounds - I only can trigger one sample in Koala I need to be able to trigger all the different samples. Why not?