Currently working my way through this tutorial in UE version 5.7. Encountered an issue when attempting to import the the “SM_Crate.FBX” step, where I was not able to access the material graph of the Plastic material as shown in the tutorial.
After some digging it seems there was a bug introduced in 5.7 that prevents importing .FBX files to create materials, and only create material instances instead. There is a thread located here:
tl:dr: Enter “Interchange.FeatureFlags.Import.FBX False” into the console to revert back to the legacy importer. This fixed the issue and created Material files, rather than Material Instances.
Hope this helps others that encounter this.