How to add feature to WFS manually? about ol-wfst HOT 6 CLOSED

                map.addControl(wfst);
                const copyButton = document.createElement('button');
                copyButton.className = 'ol-wfst--tools-control-btn ol-wfst--tools-control-btn-copy';
                copyButton.type = 'button';
                copyButton.innerHTML = `<img src="./ol-wfst-main/ol-wfst-main/src/assets/images/copy-svgrepo-com.svg"/>`;
                copyButton.title = 'Skopiuj geometrię działki';
                copyButton.disabled = "disabled";
                copyButton.onclick = () => {
                    wfst._transactWFS('insert', [feature_to_copy], wfst._layerToInsertElements);
                    copyButton.disabled = "disabled";
                    feature_to_copy = null;
                    map.getLayers().forEach(function (layer) {
                        console.log(layer.get('title'));
                        if (layer.get('title') != undefined && layer.get('title').includes('Warstwa terenowcy')) {
                            setTimeout(function(){ layer.getSource().refresh(); }, 500);
                            }
                        });
                };

const wfst = new Wfst({
geoServerUrl: 'http://10.0.10.10:8080/geoserver/openlayers/wms',
geoServerAdvanced: {
    getCapabilitiesVersion: '1.3.0',
    getFeatureVersion: '1.0.0',
    describeFeatureTypeVersion: '1.1.0',
    lockFeatureVersion: '1.1.0',
    projection: 'EPSG:3857',
},
layers: [
    {
        name: 'warstwaTerenowcy', // Name of the layer on the GeoServer
        label: 'Warstwa terenowcy', // Optional Label to be displayed in the controller
        mode: 'wfs',
        wfsStrategy: 'all',
        zIndex: 99,
        style: style_warstwa_terenowcy_0,
        namespace: "openlayers",
    }
],
language: 'en',
minZoom: 1,
showUpload: true,
showControl: true,
uploadFormats: '.kml',
beforeInsertFeature: function (feature) {
    return feature;
}
});