Check the file size. Uploads are limited to 200MB. If your media is larger than this, you'll need to compress it further, or (if it's a video) host it off-site and stream it into a Video Element.
Browser extensions and add-ons. Try temporarily disabling any browser extensions or add-ons, then try uploading the files again. If you can add files now, that means the extensions are the culprit.
Firewalls. Try temporarily disabling any software or hardware firewalls installed for your computer or your router.
Proxy server. Proxy servers are an intermediary between your computer and the servers that host Brandcast media uploads. If you use a proxy server, try accessing your site from another location or internet connection to see if that resolves your upload issue.
Wireless Internet. If you're using a wireless Internet connection, try plugging directly into your router or cable modem. Wireless connections can sometimes be unstable or inconsistent.
If you try all these steps and you still aren't able to upload media, contact us directly via the "Live Support Chat" button in Brandcast. We'll work with you to diagnose the source of the problem.