You do not have to do anything special to avail Jio offer on Moto Z2 Play. Just when you start using the mobile, insert your Jio sim and it will get activated by the Jio company itself.
No. During our extensive review and usage, we did not experience any heating issue.
Moto Z2 Play does not have hybrid sim slot but it has dedicated 2 sim card slots and 1 memory card slot.
Moto Z2 Play has protection against water. It comes with water repellent nano-coating.
Yes, it does support 4k Videos shooting as well playback.