Thanks a lot for kind reply ! I usually download custom tones first into PC and then I import files (I try at least) through HX EDIT and Stomp connected USB to PC, but it doesn't work.
Maybe all files opened are patches done with more than six block and one chain as you said. so are read as incompatible/not suitable.
If I buy as you suggest, Helix native at 99 Usd price for Stomp Users, shall I manage Helix Patches from Sowftare in order to fit STOMP restrictions? this means that you should delete some items/sounds/effects from Helix Patches to fit it?