Facing problem in uploading Attachments to quote module

i am using curl and xml to upload attachemnet.

file path would be like

$path = " http://creatorexport.zoho.com/DownloadFile.do?filepath=/1355384663709_theater-in-the-round.jpg&sharedBy=adithya1&appLinkName=ibanquet-lab&viewLinkName=room_templates_View";

$recordId="873040000000074005";

$ch=curl_init();

curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);

curl_setopt($ch,CURLOPT_URL,"https://crm.zoho.com/crm/private/xml/Quotes/uploadFile?authtoken=6169e6024147f05cfd8fb1f00ba58d3c&scope=crmapi");

curl_setopt($ch,CURLOPT_POST,true);

$post=array("id"=>$recordId,"content"=>$path);

curl_setopt($ch,CURLOPT_POSTFIELDS,$post);

$response=curl_exec($ch);

i am getting following error response message

   <?xml version="1.0" encoding="UTF-8" ?>
  

<responseuri="/crm/private/xml/Quotes/uploadFile"> <error><code>
        4424
       
</code>
<message>
        Unable to process your request. Please verify whether you have provided proper file.
       
</message>
 </error>
</response>

 Please help me in this case.