Hello johanne.ongchangco,
The annotations for WebViewer video are disabled for compare videos by default. You can enable them by using the following code snippet:
await videoInstance.UI.enableCompareMode();
instance.UI.enableFeatures(instance.UI.Feature.Annotations);
instance.Core.annotationManager.disableReadOnlyMode();
instance.UI.enableElements(['notesPanel']);
I’ve tested it, and it worked fine with the following versions (also 10.7.1 looked fine)
"@pdftron/webviewer": "10.6",
"@pdftron/webviewer-audio": "^2.21.7",
"@pdftron/webviewer-video": "^4.35.7",
However, if you encounter any bugs, please let us know and we will take a look into it.