Nokia has released an exclusive app for Lumia Windows Phone 8 devices which was announced few months back. YouSendIt allows you to share large files with ease.

App Description:

WHAT YOUSENDIT USERS SAY
“Being a contractor, many files (drawings, blueprints, pictures) are too large to just email. YouSendIt has resolved that problem and made it super easy!”

TAKE YOUR FILES EVERYWHERE
Whether you’re in the office, on-site with a client, at the airport, or working late at night in your kitchen, YouSendIt for Windows Phone 8 ensures you always have the latest version with you.
STORE
All your important documents, presentations, photos, videos and more are stored in the cloud so you can always access the latest version.
SEND
Send large files right from the app without clogging up your email. Track sent and received files with ease.
SHARE
Upload photos and videos from your phone and share the folder with anyone.
SIGN
Sign contracts, applications, invoices and more from the app then send the signed document back to your contact.
SYNC
All your files are instantly synced so you can access them later on your desktop, laptop, or tablet.

Download it here from Windows Phone Store.