"saveurl" dose not work

I tried the Show editor with the URL obtained with the following snippet, but the request is not sent to saveurl.

<form method="POST" action="https://show.zoho.com/show/remotedoc.im" target="_self" accept-charset="UTF-8">
<input type="hidden" name="apikey" value="MY API KEY">
<input type="hidden" name="output" value="url">
<input type="hidden" name="mode" value="normaledit">
<input type="hidden" name="filename" value="Untitled">
<input type="hidden" name="lang" value="en">
<input type="hidden" name="id" value="1234">
<input type="hidden" name="format" value="pptx">
<input type="hidden" name="saveurl" value="https://example.com/mypath/save.php">
<input type="submit" name="submit" value="Open">
</form>

The save command has been sent to https://docs.zoho.com/show/r_documentoperation, but the response is empty.

Response Headers

But Writer and Sheet editors are OK for the same endpoint.

Thank you for your support.

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