Hi Matias,
Thank you for contacting Syncfusion support.
We are unable to reproduce the reported issue with the provided details in Mobile mode. We have shared the simple sample in which we have tried to reproduce the issue in the below link.
Please try it and revert us with more details and modified sample if you still need any further assistance. Also ensure whether the PDF Viewer web service is mapped properly, share us the Console error/exception details. These details will be helpful for us to investigate further and assist you better.
Regards,
Akshaya
