Google Drive

With Google Drive, you can store all your files in one place, so you can access them from anywhere and share them with others.
You can tap the arrow to the right of an item's name to open the preview panel and share it, rename it, remove it, move it to a different folder , make it available offline, print it, send link to it to other users, or send it to a different app. Every time you open something with the Google Drive app, it'll update to the latest version of the file. If a collaborator is actively working on something, you won't see updates being made in real time unless you're working on a Google document.