File upload from Sencha Test WebDriver Scenario

FileUpload.js

// Scenario URL: http://examples.sencha.com/extjs/6.6.0/examples/kitchensink/?classic#form-fileuploads
describe('File Upload', function() {
    it('should select a file to upload', function() {
        // Populate name field (required)
        ST.textField('form[title="File Upload Form"] textfield[fieldLabel="Name"]')
            .setValue('My Screenshot');
        
        // Find file upload field's HTML element (the actual HTML file upload field)
        ST.element('form[title="File Upload Form"] filefield[name="photo-path"] => input[type="file"]')
            .get('id')
            .and(function() {
                // Use the id of the file input field
                var fileFieldId = this.future.data.id;
                
                // Use WebDriver.io API to choose a file (define full file path)
                ST.defaultContext.driver.chooseFile('#' + fileFieldId, '/Users/dan/Pictures/Picture1.png');
            });
    });
    
    it('should upload the file', function() {
        // Click the "Save" button, which uploads file to the server
        ST.button('form[title="File Upload Form"] button[text="Save"]')
            .click();
            
        // Wait for upload confirmation message box to be available
        ST.component('messagebox[title="Success"]')
            .textLike(/File processed on the server/);
    });
});