I just installed illustrator for iPad yesterday. I’m running a 9th gen 64 gb iPad. I open the app, select the Pencil tool, change it to art, then charcoal (1,2,or 3), then I start doodling some trees with my stylus (Apple Pencil clone). After about a minute, the app just closes and I have to start over. I’m one day into the free trial, but I won’t pay for something that is unusable.