window_id to a variant to capture a specific window.
Use Pick window… to fill in an id from the current window list.
"upload" block to a variant to POST the image to an external store.
The store must reply with {"url":"..."}.
On failure the base64 image is always returned as fallback.
"upload": {
"url": "https://store.example.com/upload",
"headers": { "Authorization": "Bearer ..." },
"include_inline": false
}
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