Notes/Comments not visible after annotated and merged pdf is saved and reopened in viewer

Which product are you using?
PDF.js Express Plus

PDF.js Express Version

Detailed description of issue
After saving annotated and merged pdf to database, note/comments aren’t rendered/visible when reopening pdf in viewer.

Expected behaviour
Notes/comments should be visible in comment/note pane.

Does your issue happen with every document, or just one?
This issue happens with every document

Link to document
I cannot provide a link to any of the affected pdfs

Code snippet
function instantiatePdfViewer(element) {
path: ‘WebViewer/lib’, // path to the PDFTron ‘lib’ folder on your server
licenseKey: ‘Insert commercial license key here after purchase’,
highContrastMode: true,
}, document.getElementById(element))
.then(instance => {
const docViewer = instance.docViewer;
const annotManager = instance.annotManager;

        //const { docViewer, annotManager, CoreControls } = instance;

        var FitMode = instance.FitMode;
        // call methods from instance, docViewer and annotManager as needed

        // you can also access major namespaces from the instance as follows:
        // const Tools = instance.Tools;
        // const Annotations = instance.Annotations;
        //Add header button that will get file data on click
        instance.setHeaderItems(header => {
                type: 'actionButton',
                img: '<svg xmlns="" viewBox="0 0 24 24"><path d="M0 0h24v24H0z" fill="none"/><path d="M17 3H5c-1.11 0-2 .9-2 2v14c0 1.1.89 2 2 2h14c1.1 0 2-.9 2-2V7l-4-4zm-5 16c-1.66 0-3-1.34-3-3s1.34-3 3-3 3 1.34 3 3-1.34 3-3 3zm3-10H5V5h10v4z"/></svg>',
                //img:  'icon-header-zoom-in-line',
                title: 'Save pdf markup to Visispecs Server',
                onClick: async () => {
                    const doc = docViewer.getDocument();
                    var docId = doc.getDocumentId();
                    const xfdfString = await annotManager.exportAnnotations({ links: false, widgets: false });
                    //const options = { xfdfString: xfdfString };//, flatten: true };
                    const data = await doc.getFileData({});
                    const blob = new Blob([data], { type: 'application/pdf' });

                    const formData = new FormData();
                    formData.append('xfdf', xfdfString);
                    formData.append('file', blob);

                    // Process the file
                    const response = await fetch('', {
                        method: 'post',
                        body: formData
                    }).then(resp => resp.json());

                    const { url, key, id } = response;

                    // Download the file
                    const mergedFileBlob = await fetch(url, {
                        headers: {
                            Authorization: key
                    }).then(resp => resp.blob())

                    var promise = getBase64(mergedFileBlob);
                    promise.then(function (result) {
                        // Do something with blob...
                        saveMarkupToVSServer(result, docId);

        docViewer.on('documentLoaded', () => {
            // call methods relating to the loaded document

            //var htmlDiv = document.getElementById('pdfviewer');
            //tabsContent['pdfviewer'] = htmlDiv;


        docViewer.on('documentUnloaded', () => {
            // remove doc from opened docs dictionary openedDocInfo
            var doc = docViewer.getDocument();
            var docId = doc.getDocumentId();
            //removeByAttr(openedDocInfo, 'cklistId', docId);



Hi there,

Thank you for contacting us.

Could you confirm if the replies on the annotations show up as notes?

Best Regards,

The comment icon(s) shows up on the document but the right comment pane is completely empty and mousing over the icon doesn’t pop up any content. When the PDF is view using acrobat the comments are visible.

Hi there,

I believe this is expected as our pricing page mentions that opening pre-existing annotations is not unavailable.

Best Regards,