How can I enable second image hover on mobile product cards?

Could you please replace your code with code below after that send a preview link?

{{ 'template-collection.css' | asset_url | stylesheet_tag }}
{{ 'component-card.css' | asset_url | stylesheet_tag }}
{{ 'component-price.css' | asset_url | stylesheet_tag }}

{% if section.settings.image_shape == 'blob' %}
  {{ 'mask-blobs.css' | asset_url | stylesheet_tag }}
{%- endif -%}

{%- if section.settings.enable_quick_add -%}
  {{ 'quick-add.css' | asset_url | stylesheet_tag }}      
{%- endif -%}

{%- style -%}
  .section-{{ section.id }}-padding {
    padding-top: {{ section.settings.padding_top | times: 0.75 | round: 0 }}px;
    padding-bottom: {{ section.settings.padding_bottom | times: 0.75 | round: 0 }}px;
  }

  @media screen and (min-width: 750px) {
    .section-{{ section.id }}-padding {
      padding-top: {{ section.settings.padding_top }}px;
      padding-bottom: {{ section.settings.padding_bottom }}px;
    }
  }
{%- endstyle -%}

  {%- paginate collection.products by section.settings.products_per_page -%}
    {% comment %} Sort is the first tabbable element when filter type is vertical {% endcomment %}
    {%- if section.settings.enable_sorting and section.settings.filter_type == 'vertical' -%}
      
    {%- endif -%}

    

      {{ 'component-facets.css' | asset_url | stylesheet_tag }}
      
      {%- if section.settings.enable_filtering or section.settings.enable_sorting -%}
        
          {% render 'facets',
            results: collection,
            enable_filtering: section.settings.enable_filtering,
            enable_sorting: section.settings.enable_sorting,
            filter_type: section.settings.filter_type,
            paginate: paginate
          %}
        
      {%- endif -%}

      
        {%- if collection.products.size == 0 -%}
          

            

            
              ## 
                {{ 'sections.collection_template.empty' | t -}}
                

                {{
                  'sections.collection_template.use_fewer_filters_html'
                  | t: link: collection.url, class: 'underlined-link link'
                }}
              
            

          

        {%- else -%}
          
            

            
              {%- for product in collection.products -%}
                {% assign lazy_load = false %}
                {%- if forloop.index > 2 -%}
                  {%- assign lazy_load = true -%}
                {%- endif -%}
                - {% render 'card-product',
                      card_product: product,
                      media_aspect_ratio: section.settings.image_ratio,
                      image_shape: section.settings.image_shape,
                      show_secondary_image: section.settings.show_secondary_image,
                      show_vendor: section.settings.show_vendor,
                      show_rating: section.settings.show_rating,
                      lazy_load: lazy_load,
                      show_quick_add: section.settings.enable_quick_add,
                      section_id: section.id
                    %}
                
              {%- endfor -%}
            

            {%- if paginate.pages > 1 -%}
              {% render 'pagination', paginate: paginate, anchor: '' %}
            {%- endif -%}
          

        {%- endif -%}
      

    

  {%- endpaginate -%}
  {% if section.settings.image_shape == 'arch' %}
    {% render 'mask-arch' %}
  {%- endif -%}

{% schema %}
{
  "name": "t:sections.main-collection-product-grid.name",
  "class": "section",
  "settings": [
    {
      "type": "range",
      "id": "products_per_page",
      "min": 8,
      "max": 24,
      "step": 4,
      "default": 16,
      "label": "t:sections.main-collection-product-grid.settings.products_per_page.label"
    },
    {
      "type": "range",
      "id": "columns_desktop",
      "min": 1,
      "max": 5,
      "step": 1,
      "default": 4,
      "label": "t:sections.main-collection-product-grid.settings.columns_desktop.label"
    },
    {
      "type": "color_scheme",
      "id": "color_scheme",
      "label": "t:sections.all.colors.label",
      "info": "t:sections.all.colors.has_cards_info",
      "default": "background-1"
    },
    {
      "type": "header",
      "content": "t:sections.main-collection-product-grid.settings.header__3.content"
    },
    {
      "type": "select",
      "id": "image_ratio",
      "options": [
        {
          "value": "adapt",
          "label": "t:sections.main-collection-product-grid.settings.image_ratio.options__1.label"
        },
        {
          "value": "portrait",
          "label": "t:sections.main-collection-product-grid.settings.image_ratio.options__2.label"
        },
        {
          "value": "square",
          "label": "t:sections.main-collection-product-grid.settings.image_ratio.options__3.label"
        }
      ],
      "default": "adapt",
      "label": "t:sections.main-collection-product-grid.settings.image_ratio.label"
    },
    {
      "type": "select",
      "id": "image_shape",
      "options": [
        {
          "value": "default",
          "label": "t:sections.all.image_shape.options__1.label"
        },
        {
          "value": "arch",
          "label": "t:sections.all.image_shape.options__2.label"
        },
        {
          "value": "blob",
          "label": "t:sections.all.image_shape.options__3.label"
        },
        {
          "value": "chevronleft",
          "label": "t:sections.all.image_shape.options__4.label"
        },
        {
          "value": "chevronright",
          "label": "t:sections.all.image_shape.options__5.label"
        },
        {
          "value": "diamond",
          "label": "t:sections.all.image_shape.options__6.label"
        },
        {
          "value": "parallelogram",
          "label": "t:sections.all.image_shape.options__7.label"
        },
        {
          "value": "round",
          "label": "t:sections.all.image_shape.options__8.label"
        }
      ],
      "default": "default",
      "label": "t:sections.all.image_shape.label",
      "info": "t:sections.all.image_shape.info"
    },
    {
      "type": "checkbox",
      "id": "show_secondary_image",
      "default": false,
      "label": "t:sections.main-collection-product-grid.settings.show_secondary_image.label"
    },
    {
      "type": "checkbox",
      "id": "show_vendor",
      "default": false,
      "label": "t:sections.main-collection-product-grid.settings.show_vendor.label"
    },
    {
      "type": "checkbox",
      "id": "show_rating",
      "default": false,
      "label": "t:sections.main-collection-product-grid.settings.show_rating.label",
      "info": "t:sections.main-collection-product-grid.settings.show_rating.info"
    },
    {
      "type": "checkbox",
      "id": "enable_quick_add",
      "default": false,
      "label": "t:sections.main-collection-product-grid.settings.enable_quick_buy.label"
    },
    {
      "type": "header",
      "content": "t:sections.main-collection-product-grid.settings.header__1.content"
    },
    {
      "type": "checkbox",
      "id": "enable_filtering",
      "default": true,
      "label": "t:sections.main-collection-product-grid.settings.enable_filtering.label",
      "info": "t:sections.main-collection-product-grid.settings.enable_filtering.info"
    },
    {
      "type": "select",
      "id": "filter_type",
      "options": [
        {
          "value": "horizontal",
          "label": "t:sections.main-collection-product-grid.settings.filter_type.options__1.label"
        },
        {
          "value": "vertical",
          "label": "t:sections.main-collection-product-grid.settings.filter_type.options__2.label"
        },
        {
          "value": "drawer",
          "label": "t:sections.main-collection-product-grid.settings.filter_type.options__3.label"
        }
      ],
      "default": "horizontal",
      "label": "t:sections.main-collection-product-grid.settings.filter_type.label",
      "info": "t:sections.main-collection-product-grid.settings.filter_type.info"
    },
    {
      "type": "checkbox",
      "id": "enable_sorting",
      "default": true,
      "label": "t:sections.main-collection-product-grid.settings.enable_sorting.label"
    },
    {
      "type": "header",
      "content": "t:sections.main-collection-product-grid.settings.header_mobile.content"
    },
    {
      "type": "select",
      "id": "columns_mobile",
      "default": "2",
      "label": "t:sections.main-collection-product-grid.settings.columns_mobile.label",
      "options": [
        {
          "value": "1",
          "label": "t:sections.main-collection-product-grid.settings.columns_mobile.options__1.label"
        },
        {
          "value": "2",
          "label": "t:sections.main-collection-product-grid.settings.columns_mobile.options__2.label"
        }
      ]
    },
    {
      "type": "header",
      "content": "t:sections.all.padding.section_padding_heading"
    },
    {
      "type": "range",
      "id": "padding_top",
      "min": 0,
      "max": 100,
      "step": 4,
      "unit": "px",
      "label": "t:sections.all.padding.padding_top",
      "default": 36
    },
    {
      "type": "range",
      "id": "padding_bottom",
      "min": 0,
      "max": 100,
      "step": 4,
      "unit": "px",
      "label": "t:sections.all.padding.padding_bottom",
      "default": 36
    }
  ]
}
{% endschema %}