Not sure if this fits to the "Integrations" Category, but yeah, change it if you feel like it's wrong.
https://developer.android.com/training/data-storage/shared/photopicker
https://developer.android.com/guide/topics/providers/cloud-media-provider
While uploading a photo to an app, photo picker interface opens. This interface (from what I can see, this looks like a new feature of Android) allows user to pick a photo from their Android device and lets user to do his action.
Anyway, I met with this recently and there is an option to select the photo from a cloud media provider; where I expected to see Dropbox among the cloud service provider options, but Dropbox wasn't there.
Seems like you guys have to apply to be shown as cloud service provider to Android, and seems like application can be done from this form.
https://docs.google.com/forms/d/1MGECQc2N-UnYFF5DIxeRq7AjrJ9bh_3KmoWsK8dq9ZM/viewform?pli=1&pli=1&edit_requested=true
So yeah, please apply, so that I can pick my photos from my Dropbox account with this interface, so that I can upload them, or send them or whatever action I wanna do.