PowerApps forms for SharePoint not showing in SharePoint Mobile App

I spoke with a patient Microsoft Support Tech and we tried various things to troubleshoot this issue.

What didn't work:

• uninstalling and reinstalling SharePoint Mobile App
• Clearing Safari (mobile) cache
• Delete prior versions of the PowerApp form
• Deleting the choice type fields
• Creating an entirely new list custom list and customizing the form

On that last one, we discovered that it matters where you open the list from. If you open from the Quick Launch menu on the mobile app, you get the OOTB SharePoint App rendering of the view and form. No customization.

If you open the list from Site Contents, you basically get the standard desktop browser rendering, which doesn't work well on an iPad or iPhone. The item could not be opened in view mode. The display panel is finicky and displayed the standard default form. But if you edit the form, you see the PowerApp form, though it's not fully functional. The choice field doesn't work for example.

So it looks like the mobile experience for this feature is not there yet, but I hold out hope that maybe my tenant doesn't have all the updates yet. The support person did not have any info that definitively mentioned the mobile support for this feature. I did read in a post by a well-known blogger @WonderLaura that this is working for her.

She wrote: "When you customize a list form, it isn’t going to be an app that will show in your list of apps, or on your phone.  But, when you use the SharePoint mobile app, and go to your list to fill out a form, it *will* be this custom PowerApp form."

https://wonderlaura.com/2017/12/08/customize-list-forms-powerapps-easy-button/