Attached document in SOAP request (MTOM), does not arrive at webservice

Question

I've created a SOAP webserice that upload document (using MTOM), but on the server side the DataHandler object is empty (dataHandler.getInputStream is empty too).

my dataHandler object

And this is the document in my request:

<content><inc:Include href="cid:BP_275627594_SP39274815_46048927_49441074-49441075_1666846379.pdf" xmlns:inc="http://www.w3.org/2004/08/xop/include"/></content>

My request properties

I've tried to solve it this way:

    <xs:element name="DocumentRequest">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="ID" type="xs:string"/>
                <xs:element name="Level" type="xs:string"/>
                <xs:element name="content" type="xs:base64Binary" xmime:expectedContentTypes="*/*"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>

@XmlRootElement(name = "DocumentRequest")
public class DocumentRequest
    implements Serializable
{

    private final static long serialVersionUID = 1L;
    @XmlElement(required = true)
    protected String ID;
    @XmlElement(required = true)
    protected String Level;
    @XmlElement(required = true)
    @XmlMimeType("*/*")
    protected DataHandler content;

@MTOM(enabled = true)
@PayloadRoot(namespace = NAMESPACE_URI, localPart = "DocumentRequest")
@ResponsePayload
public DocumentResponse document(@RequestPayload DocumentRequest request) throws Exception {
    System.out.println(request.getContent().getInputStream().available());
        
        
    

In summary, why I can't reach the attached file from code?

Thank You!