Hi Ta,
Syncfusion Blazor PDF Viewer does not have support to add the annotations in the mobile view. For annotations support in mobile view, we suggest you use the EnableDesktopMode to work in the Blazor PDF Viewer. Please refer to the below code snippet.
Code Snippet:
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<SfPdfViewerServer DocumentPath="@DocumentPath" Height="500px" Width="1060px" EnableDesktopMode="true"></SfPdfViewerServer>
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Please revert to us, if you need further assistance.
Regards,
Dhivya.