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I need to create a file in mangento 2 admin.

I'm using a button to get in a controller route.

My form ui component:

<item name="buttons" xsi:type="array">
            <item name="save" xsi:type="string">Vendor\Module\Block\Adminhtml\Report\Edit\ExportButton</item>
</item>

I used a dummy data provider just for use the submit url:

<dataSource name="bvz_report_specifier_form_data_source">
        <argument name="dataProvider" xsi:type="configurableObject">
            <argument name="class" xsi:type="string">Vendor\Module\Ui\Component\Form\DummyDataProvider</argument>
            <argument name="name" xsi:type="string">bvz_report_specifier_form_data_source</argument>
            <argument name="primaryFieldName" xsi:type="string">entity_id</argument>
            <argument name="requestFieldName" xsi:type="string">entity_id</argument>
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="submit_url" xsi:type="url" path="*/*/export"/>
                </item>
            </argument>
        </argument>
        <argument name="data" xsi:type="array">
            <item name="js_config" xsi:type="array">
                <item name="component" xsi:type="string">Magento_Ui/js/form/provider</item>
            </item>
        </argument>
    </dataSource>

In Vendor/Module/Controller/Adminhtml/Index/Export I creat an csv file and save it and put the name of file in URL.

Now I need to download this file when the page refresh.

In the index controller I have this code to make the download:

if($fileName = $this->getRequest()->getParam('file')){

            $url = $mediaUrl = $this ->_storeManager-> getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_MEDIA );
            $resultRedirect = $this->resultRedirectFactory->create();
            return $resultRedirect->setUrl($url.$fileName);
        }

The download happens but my page goes to infinite load. enter image description here

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