LG G6 - won't attach photos

[AC Question]

Two doc scanner apps and various email clients can't attach unsaved photos (through those doc scan apps) to email. G4 did this just fine.
Any solutions aside from more steps saving photos to the gallery?

 

[B. Diddy]

Welcome to Android Central! When the scanner apps scan a photo, it asks you if you want to share it before it even saves the image? Is this how you're trying to attach the photos?