Open the downloaded .txt file. Look for a line starting with http:// (the playlist) or specific username/password fields.
In your IPTV app (like GAZTV), select Add Playlist or Xtream Codes API .
Sites like Niganpro frequently update their links. Your setup should ideally allow for URL-based importing rather than static file uploads so the list stays current without manual downloads.
Open the M3U URL via "Open Network Stream".