It has been a shortcoming of Web Direct that using an iPad you are not able to view pdfs that are externally stored in interactive containers. You can set it to view and not use interactive container and see the first page. There is no way to export field contents or open the pdf for viewing. See KB13189.
This issue has been around since 2014 and I have been hoping it would be addressed by now.
The article suggests using arrow keys to scroll the contents this does not work at all if using WebDirect and iPad. Filemaker Go is not an option in the deployment being used.
Has anyone updated their server and can advise whether this was fixed but just not reported?