Supported Link Formats:

• Dropbox: Standard share link.
  https://www.dropbox.com/s/xyz/video.mp4?dl=0
• Google Drive: "Anyone with the link" permission.
  https://drive.google.com/file/d/VIDEO_ID/view
• OneDrive: Use the "Embed" link or direct link.
  https://onedrive.live.com/download?resid=...
• Direct: Any link ending in .mp4 or .m3u8.