For anyone who can't get Plex to cast to a Chromecast

If you’re accessing the Plex media server using the NAS’s IP address or name on your local area network then either use Plex’s portal from their website or access your server using HTTPS and get the web browser to accept the invalid certificate issued by your NAS.

Blame Chrome developers.
See: https://chromium-review.googlesource.com/c/chromium/src/+/1306336

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