Sub form "+ Add New" function not available on mobile app

Sub form "+ Add New" function not available on mobile app

Hello

I have an application that has a number of subforms that hold lists of items.  The number of items per use can vary.  In the web application, the subforms have a + Add New button that allows for adding additional rows in the subform to add additional items.  The mobile app of the same does not seem to have this function and does not allow me to add additional rows to the subform.  Any ideas on how to get around this other than setting the Default Entries to a large number to allow for a range of records?

Thanks
Kirby