Adobe pdf embede api – How to generate the file ID to place in metaData

I am using Adobe PDF Embedded API to view, edit & save the PDF and it is working fine.

The problem is when I tried to get the add or get the annotation list there is a File ID inside a metaData object which has to pass to it mandatory.

Using the below code to access the annotations from the PDF:

 document.addEventListener("adobe_dc_view_sdk.ready", function()

 {

  var adobeDCView = new AdobeDC.View({clientId: "<YOUR_CLIENT_ID>", divId: "adobe-dc-view"});

  var previewFilePromise = adobeDCView.previewFile({

   content:   {location: {url: "https://documentcloud.adobe.com/view-sdk-demo/PDFs/Bodea Brochure.pdf"}},
   //id is 
   metaData:  {
          fileName: "Bodea Brochure.pdf", 
           /* file ID */
          id: "77c6fa5d-6d74-4104-8349-657c8411a834"}

  },

  {

   enableAnnotationAPIs: true,

  });


  previewFilePromise.then(adobeViewer => {

   adobeViewer.getAnnotationManager().then(annotationManager => {

    // All annotation APIs can be invoked here

   });

  });

 });

Can anyone tell me how to get the File ID to add inside a metaData Object.