I have installed proto and started using it. Lots of potential there!
I am; however, experiencing inconsistencies with editing of the text elements. Double taps don't always work and it seems that the paragraph text element is not editable (is that true?).
I would suggest that editable elements receive a link in the context menu (which now only includes delete and duplicate). This would be a much more intuitive way to edit the items.
Great app and keep it up.