Dropzone js data for addFile() method

I can't figure out - what data should be passed to Dropzone.addFile() to add already uploaded file to dropzone list.

now I have:

$.each(attachments[drop.data('name')], function (index, item) {
    let mock = {
        name: item.original_name,
        size: item.size,
        dataUrl: item.relative_url,
        type: item.mime_type
    };
    drop[0].dropzone.addFile(mock);
});

and have following errors:

Uncaught TypeError: Failed to execute 'readAsDataURL' on 'FileReader': parameter 1 is not of type 'Blob'.
at Dropzone.createThumbnail (dropzone-amd-module.js:2025)
at Dropzone._processThumbnailQueue (dropzone-amd-module.js:1922)
at dropzone-amd-module.js:1907

Uncaught TypeError: Failed to execute 'append' on 'FormData': parameter 2 is not of type 'Blob'.
at Dropzone._uploadData (dropzone-amd-module.js:2514)
at dropzone-amd-module.js:2381
at dropzone-amd-module.js:2535
at Dropzone.transformFile (dropzone-amd-module.js:689)
at _loop (dropzone-amd-module.js:2532)
at Dropzone._transformFiles (dropzone-amd-module.js:2541)
at Dropzone.uploadFiles (dropzone-amd-module.js:2293)
at Dropzone.processFiles (dropzone-amd-module.js:2198)
at Dropzone.processFile (dropzone-amd-module.js:2166)
at Dropzone.processQueue (dropzone-amd-module.js:2155)

What I missed in my mock array to make this thing work propertly?

from Dropzone js data for addFile() method