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Where: Inside the composer, the Add post button under the editor A post can have more than one part. What the extra parts become depends on the platform: a real thread, a comment on your own post, or nothing at all.

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Adding a part

The button under the editor is labelled according to what the selected platform supports: Each part gets its own editor and its own media. Use the arrows to reorder parts and the bin to remove one.

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Delays between parts

Every part after the first has a Delay control: how long to wait after the previous part before publishing this one. Available delays: 1m, 2m, 5m, 10m, 15m, 30m, 1h, 2h. Delays are useful for two things: making a thread land at a human pace rather than all at once, and putting a link in a follow-up comment some minutes after the main post, which several platforms treat more kindly than a link in the post itself.

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What each platform does

If you add parts and then select a platform that does not support them, the composer will tell you at validation time rather than silently dropping them.

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Media on later parts

Some platforms accept media on the first part only. On those, the media controls on later parts are disabled, and the reason is the platform, not Postiz. X is the common exception in the other direction: a genuine thread where every part can carry its own images. Note that an X article in draft state cannot have thread replies at all.

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Writing a thread that works everywhere

If you are posting the same thread to several platforms, the safe shape is: text-only follow-up parts, media on the first part, and no assumption that the parts appear as one continuous thread. Where a platform posts them as comments instead, that is what your readers see. When that matters, detach the channel and write a version tailored to it. See Global vs per-channel.