Attachement in rtfd files

I have many rtfd files in my database that contain attachement such as PDF files. The files appear properly on my Mac but they do not in DTTG on my IPad or iPhone. I have read that at some point DTTG did not index attachement from rtfd files. Is that still the case?

RTF and RTFD are native formats to macOS but they are not to iOS. So on iOS we can only display RTFD files using an internal web browser and take whatever Apple gives us here.