Use this endpoint to get presigned upload URLs for the live stream thumbnails you want to set.

Supported thumbnail states are preparing, disconnected, and end.

After you receive the presigned URL for a state, upload the image with a PUT request.

curl --location --request PUT '<presigned_upload_url>' \
--header 'Content-Type: image/png' \
--data-binary '@/path/to/thumbnail.png'