Most likely a limitation of the built-in PDF viewer used. If I were to guess, it's not something that can be easily added. You need to rely on an external viewer for viewing the signatures.

@Mathias Dahl  Thanks a lot for the answer.  I hope there is no way that we configure to use an external viewer within Aurena to preview?    I assume you meant to download it and view?

Yes, you need to download and open with an application on your PC. This can be fully automated by telling your web browser to always open downloaded PDF files automatically and you don't even need the Aurena Agent to do it.

Good luck!

@Mathias Dahl  Thanks a lot for the confirmation!