word processor help

[cpc12]

I have a mac and a galaxy s5

I need to be able to create, edit and view documents stored in my dropbox.

I was going to purchase office for mac but did not know how it would work with my galaxy.

I have all my files on .pages and I cannot read or edit them on my s5

I dont mind switching to a different processor as long as its compatible with my mac and my s5

thanks