Hi @Greg27 ,
As I mentioned in my first reply, the SharePoint form is a little special with other apps created in PowerApps. Although SharePoint form is created in PowerApps, it is the real function in SharePoint indeed. If you had used SharePoint on-premise, you will know the InfoPath. Here, PowerApps is just an tool to edit/create SharePoint form like InfoPath. You cannot share this SharePoint form to others or publish, since SharePoint form is based on a SharePoint list/library. There is no point in taking out a SharePoint form on its own.
So if you want to make sure if you have created the form, SharePoint provides the way. You can go to list/library settings > Form settings to check the results. By default, SharePoint use the default SP form:

Besides, for your second question, do you have a M365/O365 license(with PowerApps service plan) or a PowerApps full product license? Since PowerApps and SharePoint need different licenses.
Best regards,
Allen