Here is a tutorial for how to FTP large files up to your website and then use them.
FTP software is the old fashioned way people used to update their website by transferring files.. Its a bit technical, but it does make your life easier if you regularly need to upload a lot of files, or upload large filess.
FTP stands for File Transfer Protocol. Most FTP programs have 2 windows, one for the files on your computer, and another for the files on the remote server. (eg our web server). There should be 2 arrows in the middle. Select the files you want to transfer, and use the arrows to move them in the desired direction, eg upload or download.
Part 1 - Getting your FTP account details
Part 2 - Using your FTP software
Part 3 - Using your recently uploaded files
Example of FileZilla system below - left hand side is files on computer, right hand side is files on website.
Drag and drop files from computer to appropriate file within the CMS files area on the right.