This functionality was removed in Update 36 and SmartPlant Markup Plus Server 2019 SP 2.
Error
When viewing a non-Hexagon file in the View and Markup page, an "unable to load" error displays.
Common Cause
You might encounter this problem if SSL certificates were not imported properly.
Solution
Make sure all SSL certificates, including intermediate certificates, are imported to:
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Local Computer > Personal and Local Computer > Trusted Root Certification Authorities in IIS Manager on the SmartPlant Foundation application server, SmartPlant Markup Plus server, and SmartPlant Foundation File Server (if separate from the application server)
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The local keystore on the SmartPlant Markup Plus server, using Java Keytool. For help, see the Apache Tomcat documentation at tomcat.apache.org.