Clearing your web browser's cache can fix many problems as well as this one.
Updating your Adobe Flash to the newest version can fix many issues. Follow these steps to do so:
There might be a problem with your ISP (Internet Service Provider). Try again later or call their support line.
Check if you're still online, try searching something on Google for example.
Rebooting a device can fix many issues. Try uploading a file again, after the reboot.
If you don’t receive the email in the next 2 minutes please check your junk folder, and add [email protected] to your safe sender list.