Needs support for editing from within the default Photos iOS app using native "extensions" menu.
So it is possible to edit documents without leaving built-in app.
Shahab Ab commented
1) Ability to directly import photos stored on OneDrive from import menu
2) Ability to share / Open in from other apps to Office Lens at least photos app
Jackson Smith commented
Support for both Editing within photos app, and for sharing from other apps.