Send chat message with attachment in teams channel

Trying to post chat message with attachment in teams channel using graph API. We are able to post the message successfully but when try to preview the attachment we are seeing a message please find the screenshot below. Please suggest a way to resolve this issue.

tried request to post using graph call:

POST https://graph.microsoft.com/v1.0/teams/{teamsId}/channels/{channelId}/messages 

{ 

    "body": { 

        "contentType": "html", 

        "content": "Test with Graph Attachment. <attachment id=\"{eTag}\"></attachment>" 

    }, 

    "attachments": [ 

        { 

            "id": "{eTag}", 

            "contentType": "reference", 

            "contentUrl": "{SPO Attachment URL}", 

            "name": "Test Versions.docx" 

        } 

    ] 

}