I've been using Miro for a few days (free version for now) and I've noticed a few things that are very weak for the iPad.
1. I can't put my hand on the canvas to draw freely with the pencil. In other apps of this type I can freely rest my hand on the whiteboard and draw whatever I want. In your app, it detects this as a touch and it even came to a situation that I "touched" my hand so many times on many points that the app crashed and I had to turn it off.
2. The Magic Keyboard is practically not supported on the board. I thought I would do the same things as on the computer, and it turned out that a great deal of elements do not work and I had to operate the application with touch, despite the fact that use Magic Keyboard with an iPad.
3. The pencil support itself seems only basic and it is difficult to use the stylus with your application. Compared to EverNote,Notes or FreeForm it is weak.
Please improve iPad support for your app. I use an iPad Pro and it's really been a long time since I've handled any app this badly.