Dropbox allows users to create a special folder on their computers, which Dropbox then synchronizes so that it appears to be the same folder (with the same contents) regardless of which device is used to view it. Files placed in this folder are also accessible via the Dropbox website and mobile apps. Dropbox uses a freemium business model, wherein users are offered a free account with a set storage size and paid subscriptions for accounts with more capacity.
Dropbox provides client software for the OS systems Linux, OS X, and Windows NT; for the mobile systems Android, BlackBerry OS, iOS, and Windows Phone; and for web browsers; as well as unofficial ports to MeeGo and Symbian.
Dropbox uses a freemium business model, where users are offered a free account with a set storage size and paid subscriptions for accounts with more capacity. All basic users are offered an initial 2 GB of free online storage space. The desktop client has no restriction on individual file size; files uploaded via the website are limited to no more than 10 GB per file. To prevent free users from creating multiple linked free accounts, Dropbox includes the content of shared folders when totaling the amount of space used on the account. For free accounts, the total amount of traffic that all links together can generate without getting banned is 20 GB per day. For Pro and Business accounts, the limit is 200 GB per day.
Here is the method to create a submission on Dropbox.
First go to www.dropbox.com and fill your details for signup.