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My mid-size credit union (in the US) manages that just fine, and their website generally is kinda sucky.

GP may not be in the USA. I haven't ever seen a cheque in my life (I'm 30 and from Europe).

I've never heard of GP

GP is like OP but one level above. They're referring to the user staringback's post.

Yes. Stands for "grandparent", to be complete, because the message above is often referred to as the parent.

They let you do this with an app?

I literally have never heard of any US-based bank that has a smartphone app that doesn't let you deposit a check.