Currently the available action and triggers for devops are listed here.
For sending the attachment you can refer to Sending attachment section and if you are using Devops connectore then you need to use the action "Send an HTTP request to Azure Devops" where you need to pass the parameters as per the Azure DevOps REST API.
Alternatively you can also use Request/Response connector or Native HTTP connector for any HTTPS request.
Hope the above helps. Feel free to get back to me if you have any queries or concerns.
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