How to Fix the Missing Add Section on Customize/Theme Editor?

This seems to be occurring due to a Shopify update. It seems that themes can no longer be uploaded without a section.

At least one section is mandatory for it to work.

To fix the issue, open the edit code of on your theme and copy the following to the "index.json" file.

{
  "sections": {
    "1d0bb279-0557-4faf-9a5d-27a9ac55062c": {
      "type": "featured-image",
      "settings": {
        "show_on_desktop": true,
        "show_on_mobile": true,
        "full_width": true,
        "section_style": "section-blank",
        "image_link": ""
      }
    }
  },
  "order": [
    "1d0bb279-0557-4faf-9a5d-27a9ac55062c"
  ]
}

This will add a featured image section to the theme and the "add section" button will appear below it.

You can then delete the featured image section, however only after they add a second section.

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