Thanks!
I have Dropbox, when I bought Samsung S4 in that time Dropbox said 50gb free for Samsung Users so I am still using it and couldn't full it yet.

I wrote "I have 8gb space on my phone", because samsung s4 has 16gb but system takes 8gb. LG g3 16gb has almost 9gb for users. Thats so stupid!
Firstly photo part just scares me i've uploaded many pictures on dropbox and if i delete pictures on my phone will those photos will be delete on dropbox too or Google Drive?
Secondly I think there is no app for connecting apps online not in phone space, because Worldwide internet speed cannot afford for internet quota. If internet become cheap and very commen then now It will be like skynet. Everything will on internet not harddrives or microsd.