I have Firefox 26. I want to use FileLink to send large attachments. FileLink instructions tell me to go to Tools, Options, Attachments, Out-going and select my storage provider (in my case Dropbox) from a dropdown menu. When I go to Tools, Options, there is no "attachments" label to click, and there is nothing in any of the options offered that appears to lead to that dropdown menu. The FileLink instructions say it's supposed to work on everything above Firefox 13, or 16. How do I make it possible to send a large (in this case audio) file via Firefox?