Howto add Blocks?

Hello all, it turns me crazy but I do not understand how to add blocks. I can write them myself following tutorial, but when I load plugin, like grapesjs-block-basic for example, blocks don't show. Here is my code:

var editor = grapesjs.init({
    // Indicate where to init the editor. You can also pass an HTMLElement
    container: '#gjs',
    // Get the content for the canvas directly from the element
    // As an alternative we could use: `components: '<h1>Hello World Component!</h1>'`,
    fromElement: true,
    // Size of the editor
    height: '90vh',
    width: 'auto',
    // Disable the storage manager for the moment
    storageManager: {
        //type: null
        id: 'gjs-',             // Prefix identifier that will be used inside storing and loading
        type: 'local',          // Type of the storage
        autosave: true,         // Store data automatically
        autoload: true,         // Autoload stored data on init
        stepsBeforeSave: 1,     // If autosave enabled, indicates how many changes are necessary before store method is triggered
        storeComponents: true,  // Enable/Disable storing of components in JSON format
        storeStyles: true,      // Enable/Disable storing of rules in JSON format
        storeHtml: true,        // Enable/Disable storing of components as HTML string
        storeCss: true,
    },

    plugins: ['gjs-blocks-flexbox', 'gjs-blocks-basic'],

    pluginsOpts: {
        'gjs-blocks-flexbox': {
            // options
        },
        'gjs-blocks-basic': {
            blocks: ['column1', 'column2', 'column3', 'column3-7', 'text', 'link', 'image', 'video', 'map']
        }
    },

    // Avoid any default panel
    panels: {
        defaults: [
            {
                id: 'layers',
                el: '.panel__right',
                // Make the panel resizable
                resizable: {
                    maxDim: 350,
                    minDim: 200,
                    tc: 0, // Top handler
                    cl: 1, // Left handler
                    cr: 0, // Right handler
                    bc: 0, // Bottom handler
                    // Being a flex child we need to change `flex-basis` property
                    // instead of the `width` (default)
                    keyWidth: 'flex-basis',
                },
            },

            {
                id: 'panel-switcher',
                el: '.panel__switcher',
                buttons: [
                    {
                        id: 'show-layers',
                        active: false,
                        label: 'Layers',
                        command: 'show-layers',
                        // Once activated disable the possibility to turn it off
                        togglable: true,
                    },
                    {
                        id: 'show-style',
                        active: false,
                        label: 'Styles',
                        command: 'show-styles',
                        togglable: true,
                    },

                    {
                        id: 'show-blocks',
                        active: true,
                        label: 'Blocks',
                        command: 'show-blocks',
                        togglable: true,
                    },

                    //...
                ]
            },

            {
                id: 'panel-devices',
                el: '.panel__devices',
                buttons: [
                    {
                        id: 'device-desktop',
                        label: '<i class="fas fa-desktop"></i>',
                        command: 'set-device-desktop',
                        active: true,
                        togglable: false,
                    },
                    {
                        id: 'device-tablet',
                        label: '<i class="fas fa-tablet-alt"></i>',
                        command: 'set-device-tablet',
                        togglable: false,
                    },
                    {
                        id: 'device-mobile',
                        label: '<i class="fas fa-mobile-alt"></i>',
                        command: 'set-device-mobile',
                        togglable: false,
                    }
                ],
            }
        ]
    },

    blockManager: {
        //appendTo: '#blocks',
        appendTo: '.blocks-container',
    },

    layerManager: {
        appendTo: '.layers-container'
    },

    selectorManager: {
        appendTo: '.styles-container'
    },

    styleManager: {
        appendTo: '.styles-container',
        sectors: [
            {
                name: 'General',
                open: false,
                buildProps: [
                    'float', 'display', 'position', 'top', 'right', 'left', 'bottom'
                ]
            },
            {
                name: 'Dimension',
                open: false,
                buildProps: [
                    'width', 'flex-width', 'height', 'max-width', 'min-height', 'margin', 'padding'
                ],
                properties: [
                    {
                        id: 'flex-width',
                        type: 'integer',
                        name: 'Width',
                        units: ['px', '%'],
                        property: 'flex-basis',
                        toRequire: 1,
                    }
                ]
            },
            {
                name: 'Decorations',
                open: false,
                buildProps: ['border-radius-c', 'background-color', 'border-radius', 'border', 'box-shadow', 'background'],
            },

            // {
            //     name: 'Dimension',
            //     open: false,
            //     // Use built-in properties
            //     buildProps: ['width', 'min-height', 'padding'],
            //     // Use `properties` to define/override single property
            //     properties: [
            //         {
            //             // Type of the input,
            //             // options: integer | radio | select | color | slider | file | composite | stack
            //             type: 'integer',
            //             name: 'The width', // Label for the property
            //             property: 'width', // CSS property (if buildProps contains it will be extended)
            //             units: ['px', '%'], // Units, available only for 'integer' types
            //             defaults: 'auto', // Default value
            //             min: 0, // Min value, available only for 'integer' types
            //         }
            //     ]
            // },
            {
                name: 'Extra',
                open: false,
                buildProps: ['background-color', 'box-shadow', 'custom-prop'],
                properties: [
                    {
                        id: 'custom-prop',
                        name: 'Custom Label',
                        property: 'font-size',
                        type: 'select',
                        defaults: '32px',
                        // List of options, available only for 'select' and 'radio'  types
                        options: [
                            { value: '12px', name: 'Tiny' },
                            { value: '18px', name: 'Medium' },
                            { value: '32px', name: 'Big' },
                        ],
                    }
                ]
            }
        ]
    },

    deviceManager: {
        devices: [
            {
                name: 'Desktop',
                width: '', // default size
            },
            {
                name: 'Tablet',
                width: '480px', // this value will be used on canvas width
                widthMedia: '768px', // this value will be used in CSS @media
            },
            {
                name: 'Mobile',
                width: '320px', // this value will be used on canvas width
                widthMedia: '480px', // this value will be used in CSS @media
            }
        ]
    },

});

Can somebody explain me what I'm missing? I think that loading grapesjs-blocks-basic.min.js should make those blocks visible in automatic way, but I'm wrong in believing this? Please help me and put me on the right way.. many thanks in advance