Following on from @bhonobo’s comment
Despite the team doing such a great job on making the app easy to use, I think it’s inevitable that any app will get users asking a small amount of the relatively small number support requests along the lines of “How do I…”.
It would be proactive to write up a series of FAQs articles, expanding the page already in place and have a link to the page from the app.
Perhaps also include a search form in the app somewhere, that’s pre-filled and showing articles relevant to the part of the app you’re viewing at the time. I know Monzo use intercom and I’m not sure if they have such a feature. Just as an example of what I mean, Help Scout do offer this feature.
With the suggestion feature, you can put articles front and center based on the page people are viewing.