Stack membership?

Is it possible to purchase monthly/yearly plex pass and have it added to your current one? Is it possible to do this from within the Android app?

not exactly sure what you mean by “stacking”

You cannot directly upgrade/change if you have a subscription from another payment system. meaning if you have a subscription billed through our website you cannot directly upgrade or change to a subscription billed through Google Play. You must cancel renewal and wait for the current to expire then you can get one from the other payment system