SpookDroid
Ambassador
For me, I'm also looking up a service where I can easily see thumbnails and flip through them like photo apps and browse/select videos that way.
I have amazon prime photos right now and it's like $50 / year for unlimited storage. I may try that out to see how it works since I like the interface.
Edit: Nevermind, Amazon is a no go. No way to copy / get links on a mobile device and send them.
Dropbox has a dedicated Gallery app that might be what you're looking for if you use their service. For Google, you have the Photos app or you can even do that on the Drive app.