Looking for Registration preview submission

Hello,

I am planning out a project, and Ultimate Member with all of the add-ons fits my needs almost perfectly, but there are a few things I need to check on before I can buy. I’m comfortable custom coding PHP, CSS, JS, ACF, and assuming these will need that. I’m just seeing if anyone else has done it, through another plugin with UM, coding, or UM itself, and if they have any direction or starting points. Also

• Registration submission preview. I have looked through UM docs and features and don’t see it. On the web I see Gravity Forms has an add-on that does this, if it helps. I obviously do not want to go down what is surely a messy rabbit hole of using the two together.
• Multi-step registration

Thanks,
Ben