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

To get the annotations I have found the below code:

 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

   });

  });

 });

Found this note from the documentation:

To enabled the annotation APIs, you must pass a PDF ID in the metadata field when invoking the previewFile API. This ID uniquely identifies the PDF so that annotations can be added.

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