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FYI, if your CU doesn't have a "deposit a check with a smartphone" feature in their app, see if the Sprig app (iOS or Android) is in the same Co-Op network. I use it all the time to deposit checks by photo. There can be a day or two delay on availability of funds, but it is often way more convenient than driving out of my way to go to a shared branch.
I was ready to find a new credit union, until I called to ask my CU if they planned on developing that for their app. They said "Oh, you can just use Sprig." Why didn't they tell me that years ago?!?