A beat lease is an Contract that allows an artist you to use a beat. 

Your lease will still be valid, my contracts stipulate that if an exclusive beat is bought, the active leases remain active but you just can’t upgrade the license

You can defiantely use it in a video. If your channel is capable of getting large number og views, you should get the unlimited lease so that your views are not cappee

You can upgrade the license, email hello@reggiebeatz.com