async function applyEdits() {
    const FeatureLayer = require('esri/layers/FeatureLayer');

    const url = 'https://serverurl.com/arcgis/rest/services/ESRI/ESRI_TEST/FeatureServer/'; // 

    const layer = new FeatureLayer({
        url: url.concat('1') // 
    });

    let response = await layer.queryFeatures({
        outFields: ['*'],
        returnGeometry: false,
        where: '1=1'
    }); console.log('queryFeatures: '); console.log(response);

    const data = new Blob([JSON.stringify({
        data: 'test data'
    })]);

    const attachmentEdits = new Array({
        feature: response.features[1], // 
        attachment: {
            name: 'Attachment1',
            globalId: '{7920F2B1-0DC1-48DD-A5A5-41BE6E9F7FDA}',
            contentType: 'application/json',
            data: JSON.stringify({
                data: 'test data'
            }) //data
        }
    }); console.log('attachmentEdits: '); console.log(attachmentEdits);

    try {
        response = await layer.applyEdits({
            addAttachments: attachmentEdits
        }, {
            globalIdUsed: true,
            //rollbackOnFailureEnabled: true
        }); console.log('applyEdits: '); console.log(response);
    }

    catch (exception) {
        console.error(exception);
    }

    finally {
        const attachments = await getAttachments(layer, [response.features[1].attributes[response.features[1].layer.objectIdField]]); console.log('getAttachments: '); console.log(attachments);
    }
}

async function getAttachments(layer, objectIds) {
    return await layer.queryAttachments({
        objectIds: objectIds
    });
}