Attaching sounds etc doesn't work here. Images & replays etc sure, audio nope.

Fire it on a file upload host & send a link to the file, it's the best way of handling it.

Did you means Mediafire?

You can use them if you want to. They do have a habit of taking things down due to copyright shit though, I'm almost impressed with their content matching tech since they're pretty efficient.

You can always send via email. It works for me atleast. Just compose a message and add the file. If you don't want to do that, just upload to mediafire or your preferred service.

If i upload to mediafire, is the file that i uploaded is visible?

It depends. I am pretty sure theres a 1 time open only option. If you can't find it, I wouldn't worry because it's really unlikely for someone to find your file.