I can't find a reason for this issue:
FM Server 16 on Mac Mini
Data separation model
Data file: one field is a container with external storage not encrypted
UI file: one layout points to the Data file and displays the container field (interactive mode).
All files local: works fine
UI File local, Data file on FMS: works fine
UI File and Data file on FMS: the PDFs are not displayed in interactive containers, but are displayed in non-interactive containers.
FMS 16 on Mac Mini, any FMP 16 client (Mac or Win).
I can't imagine why!
If I open directly the Data file distributed by FMS using FMP, all is ok!
Note that in similar setups using FMS on Windows, the solution works perfectly.