noob question about collision inside hollow geo

[ldotchopz]

I have a shpere with a shell applied. i made it a physX shape and addded a physX collsion and set it to be the smaller inside sphere. so the outer shell would fall and hang off the inside sphere. i cannot get it to work. the hull doesn't see the outer spehere as a shell and bugs out and flys away.

It seems simple but maybe i'm missing something?

I have added scene file if that helps.