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Where: The thread builder lives in the Remix screen (https://my.blotato.com/remix). The newer Agent screen (https://my.blotato.com/agent) does not support thread creation yet - if you're in the Agent "Add Post" area and don't see + Add to Thread, switch to Remix.
To create a thread in the web app:
Open Remix (https://my.blotato.com/remix)
Click + Add Post and select your platform (X, Threads, or Bluesky)
Start typing the first post
Click + Add to Thread to add each additional post

To create a Twitter thread in a single API call, put the first tweet in content.text and add the rest of the thread in content.additionalPosts[]. Blotato handles reply chaining -- you do not need to capture tweet IDs.
Each entry in additionalPosts has its own text and mediaUrls fields.
See the full payload example in the API Quickstart or the Publish Post reference.
Threads also work for Bluesky and Threads using the same additionalPosts field.
For an automated thread workflow (email yourself an idea, AI writes the thread, Blotato posts it), see: Email to Long Form Thread
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