grapesjs如何上传图片到后端？

js代码

     var editor = grapesjs.init( {
            showOffsets: 1,
            noticeOnUnload: 0,
            container: '#gjs',
            height: '100%',
            storageManager: false,
            plugins: [
             ],
            assetManager: {
                upload: 'upload.php',
                assets:assetdata,
                uploadFile: (e) => {
                    const formData = new FormData();
                    var files = e.dataTransfer ? e.dataTransfer.files: e.target.files;
                    for (let i = 0; i < files.length; i++) {
                        formData.append('files[]', files[i]);
                    }

                    fetch('/upload.php', {
                        method: 'POST',

                        body: formData
                    })
                    .then(response => resp...

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