"Unable to save" message bug save works

"Unable to save" message bug save works

I'm most likely returning something wrong but couldn't find it in the docs.

When using the Zoho Writer Office Integrator API and saving a .docx file, it gets posted and saved correctly to the save_url but the UI shows:

"Unable to save: An error occurred while posting the content to your storage server. Please try again."

What's the request expecting as a response?, I'm returning a HTTP 200 with "RESPONSE: Document saved" as content.
Tried without content and it's giving the same message.

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