File Managers

Dropbox - Dropbox

Free
Dropbox lets you bring all your photos, docs, and videos anywhere and share them easily. Access any file you save to your Dropbox from all your computers, iPhone, iPad, and the web. With Dropbox you’ll always have your important memories and work with you.
https://itunes.apple.com/us/app/dropbox/id327630330?mt=8

Filer - Dan Leehr L.L.C.

$3.99
Filer is a unique application for iOS devices that lets you manage, view, and share your files. You can get your files on the go when you do have a network connection, and view them when you don't.
https://itunes.apple.com/us/app/filer/id318884764?mt=8

Google Drive - free online storage from Google - Google, Inc.

Free
Get started with Google Drive for free and have all your files within reach from any smartphone, tablet, or computer. All your files in Drive – like your videos, photos, and documents – are backed up safely so you can’t lose them. Easily invite others to view, edit, or leave comments on any of your files or folders.
https://itunes.apple.com/us/app/google-drive-free-online-storage/id50787...