UI5 - Pass file uploaded with FileUploader in a Fragment to PHP

I am working with OPENUI5, PHP and MYSQL and I have a problem.

I have a call view (App.view.xml) that calls a frament when I press a button (CreateDialog.fragment.xml). This fragment contains basically a SimpleForm with 2 fields (FileUpload and a TextArea).

       <f:SimpleForm 
            id="FormChange480_Trial"

            maxContainerCols="1"
            editable="true"
            layout="ResponsiveGridLayout"

            labelSpanL="2"
            labelSpanM="2"
            labelSpanXL="3"

            emptySpanL="1"
            emptySpanM="1"
            emptySpanXL="1"

            columnsL="1"
            columnsM="1"
            columnsXL="1"

            class="editableForm"
        >

        <f:content>


            <u:FileUploader
                name="adjunto"
                width="100%"
                enabled="true"
                id="attached"
                tooltip="Select the file"
                style="Emphasized"
                placeholder="Choose a file for Upload..."
                mimeType="image/png,image/jpeg,application/pdf"
                fileType="pdf,jpeg,png"
                change="chequeo2"
            />
        </f:content>
    </f:SimpleForm>
</VBox>


<beginButton>
    <Button text="{i18n>Create}" id="Crear_Guardar" icon="sap-icon://save" press="onDialogCreateButton1" />
</beginButton>

When I fill the form i click on the create button, I receive in the controller (App.controller.js), the value of the TextArea plant.getValue (), and the name of the file subido attached.getValue ().

At that moment, I call a file "create.php" using AJAX.

My question is: How do I save the file? Currently in the PHP file I do not receive the file print_r ($ _ FILES); - > empty

Thanks