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Clarify message attachment rendering in webhooks #1499

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svelle merged 3 commits into from
Apr 1, 2026
Merged

Clarify message attachment rendering in webhooks #1499

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f601593
Clarify message attachment rendering in webhooks
svelle Mar 31, 2026
12714d6
Update site/content/integrate/webhooks/incoming/_index.md
svelle Mar 31, 2026
0decb56
Merge branch 'master' into svelle-patch-1
svelle Apr 1, 2026
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3 changes: 3 additions & 0 deletions site/content/integrate/webhooks/incoming/_index.md
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Expand Up @@ -197,5 +197,8 @@ Some common error messages include:

If your integration prints the JSON payload data instead of rendering the generated message, make sure your integration is returning the `application/json` content-type.

#### Why aren't my message attachments rendering?
Make sure `attachments` is a **top-level field** in your webhook JSON payload, not nested inside `props`. While the REST API uses `props.attachments`, incoming webhooks expect `attachments` at the top level.

For further assistance, review the {{< newtabref href="https://forum.mattermost.org/t/how-to-use-the-troubleshooting-forum/150" title="Troubleshooting forum" >}} for previously reported errors, or {{< newtabref href="https://mattermost.com/pl/default-ask-mattermost-community/" title="join the Mattermost user community" >}} for troubleshooting help.

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