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Live Preview lets you test the generated app before it goes live. Template imports can open a preview automatically when a previewUrl is available. Links from the feed open in the appropriate preview surface for your device.
1

Open preview

After the website or app finishes building, the Browser panel on the right normally opens the preview page automatically. You usually do not need to open it yourself.
2

Interact with the app

Click through the app as a user would, then return to chat for changes.
3

Refresh after edits

Use Refresh in the preview header to reload the current preview.

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If preview does not open

If the Browser panel does not open automatically, send a short instruction in chat, for example: 
Open the preview
or 
Reopen the preview
The AI will bring the dev server back up if needed and show the preview in the Browser panel.
Preview links are documented as a preview address or preview URL. The docs intentionally do not hard-code any internal preview domain.