sample-process-models/misc/qa/forms/test-non-required-nested-single-file-upload/fileupload-schema.json

{
    "properties": {       
        "supporting_files": {
            "type": "array",
            "title": "Supporting Files",
            "description": "Add any relevant documents for this request (quotes, screenshots, service/product brief, etc.)",
            "minItems": 0,
            "items": {
                "type": "object",
                "title": "Add New File",
                "properties": {
                    "supporting_file": {
                        "type": "string",
                        "title": " ",
                        "format": "data-url"
                    }
                }
            }
        }
    }
}