Use the Fidelity app to take a photo of the check. I use Fidelity checking for withdrawaling foreign currency too. Easily the best banking product I’ve ever used and I can’t imagine using anyone else.
You can mail checks much larger than $10k in. That is what I usually do, as it’s less of a hassle than getting to a branch during business hours. Schwab even provides post paid enevelopes for you to use.