First, are you using a TRS cable?
With just a TRS cable into the amp footswitch jack, try shorting T to S and R to S.
This should give Toneprint on/off and Toneprint 1/2 switching as per diagram below
Re Aux connection - how are you connecting from the phone?
Out the phones socket (use a stereo minijack cable), or USB out the phone using a converter cable?
Plug the minijack cable into the amp - touching the other plug end should give some buzz if working.