I propose you add google drive integration for receipt hub as well as dropbox.
This is mainly because GDrive replicates the behavior of Camscanner (such as but not limited to automatic cropping). However it allows you to do this with a widget on your home screen where in one click the camera app is opened, you can take a photo and it will save it in the predefined folder for a total of three screen touches (on my phone that takes around 2 seconds in total). I believe this is a huge convenience and time improvement over using camscanner and dropbox
Further Reading:
https://support.google.com/drive/answer/3145835?hl=en