Landing Page content Update Free form

[Manu-Choudhary]

I'm trying to update the content of a free-form landing page. The URL I'm using is 

/rest/asset/v1/landingPage/{id}/content/{contentId}.json

ex: /rest/asset/v1/landingPage/1865/content/1912.json

where 1865 is Landing page ID and 1912 is the content ID.

content type: application/x-www-form-urlencoded 

and body consists of : type=Image&value=13590

I'm getting an error code 709 and message : 

Operation is only allowed on draft landing page content

Can someone help me through

[Tony_Mayse]

The interplay between templates and content can be complicated. Please submit a support case as that will allow us to look at the specifics of the template, existing content, the exact request and response etc.