You get 20 GB of free total file storage per active user (or based on your minimum user agreement, whichever is higher). If you exceed your total free storage, then the price is $20 a month for every 50 GB over of the total free storage.
There are alternatives for where you can host the files. To see these options, please read over the File Storage Choices and WebDAV Requirements guide.
*NOTE: Allocated disk space and cost on our servers is subject to change at any time.