Remote API Form Submit with Zoho Writer

Remote API Form Submit with Zoho Writer

Zoho Writer loads the document but its completely blank.

here is my code

<form method="POST" action="https://exportwriter.zoho.com/remotedoc.im" enctype="multipart/form-data" target="_self"
accept-charset="UTF-8">
File : <input type="file" name="content" size="38"> <br>
<input type="hidden" name="apikey" value="c9cdafe97456bdda65e720e8e4bbd166">
<input type="hidden" name="output" value="editor">
<input type="hidden" name="mode" value="normaledit">
<input type="hidden" name="filename" value="UseCases.docx">
<input type="hidden" name="id" value="12345678">
<input type="hidden" name="format" value="docx">
<input type="submit" name="submit" value="Open/Edit">
</form>

It just displays the name of the file in the URL, but the content is blank when the editor loads. Am I giving the wrong parameters. Do i have to mention the absolute path of the filename?