Tap “Get started”, then enter the four-letter code at plex.tv/link on any device. Plex is optional: without a Plex server, tap “Skip — I don't use Plex” (on Apple TV “I don't use Plex”) and set up only IPTV; you can connect Plex later under Settings › Plex. Interlace picks the fastest connection to your server; you can change it under Settings › Plex.
Plex requires either a Plex Pass on the server you are watching from, or a Remote Watch Pass on your account, for playback outside the server’s network. This is enforced by Plex Media Server, not by Interlace. Streaming at home is unaffected.
Settings › IPTV takes an M3U playlist URL or Xtream Codes credentials from your provider, plus an optional XMLTV guide URL. Interlace ships without any channels; you bring your own subscription.
Interlace tries Apple’s player first and falls back to its FFmpeg engine for MKV, TS, DTS and multichannel audio. Send us the codec line from the player’s Info panel if a file still fails.
Converted downloads run only while Interlace is open; original-quality Plex and IPTV downloads continue in the background.
Open Interlace on the Apple TV and the iPhone on the same Wi‑Fi; the TV appears under Settings › Play on. The phone becomes the remote.