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Where: the Integrations section These are not social channels. They are external services that produce media, connected so you can pull their output into a post without downloading and re-uploading it.

Connecting one

1

Open Integrations

The Integrations entry in the left rail.
2

Pick the service and paste your API key

You supply your own key, so usage is billed by that service to you, not through Postiz.
3

Use it in the composer

The Import button in the attachments bar now offers that service. Pick a generated asset and it attaches to the post.
Connected services are listed in the sidebar, each with a Delete Integration option.

What is available

The current integrations are AI video services, HeyGen being the main one. Because each needs your own account and key, the exact list depends on what your instance has enabled.

How this differs from AI generation

Use a third-party integration when you already use that tool and want its output in your calendar. Use built-in AI when you just need an image or a short video and do not care which engine made it.