Insert Picture Into Form

I'm using Adobe Acrobat Version 18.12.00 iOS mobile app.  I have a form with boxes for insertion of pictures.

Adobe Acrobat Reader DC on a Windows desktop handles the form this way:  when you click on the blank picture box it opens a window allowing you to browse for a photo file.  Once the desired file is selected it inserts it into that box.  Once the PDF is saved the photo is saved with it.

When I try the same process with the iOS app, nothing happens.  When I tap on the blank picture box it becomes highlighted, but there are no options to do anything with it.  Does anyone know of a way to make this work, or is the iOS app not able to handle that functionality?

Thanks in advance for any help of suggestions.