Allow me to upload files to my document library from the app
I wanted to be able to upload a photo from my mobile device directly into the document library. I was instead forced to launch the one drive app that I didn't have.
Star D. commented
My experience mirrored the original poster's. I was trying to access a Picture Library (both via Site Contents and the link under "Recent" in the Quick Launch) and was prompted to get the OneDrive App.
Additionally, after I installed it, the OneDrive app will not open that Picture Library (the SharePoint App will, but only through Site Contents) .