Preflight is designed for prepping 3ds Max 3D models to export to game engines, such as Unreal Engine. It's a series of checklist tasks to run through before using Datasmith to export.
In this case, we use the Sculpt plugin first to quickly attach everything by material. Then we open Preflight and run through the tasks, skipping some - as they're not relevant for this model.
Once complete, click on Send to Datasmith and the cleaned-up model is exported ready to import into Unreal Engine.
For more Preflight information;
https://docs.sinisoftware.com/preflight
https://www.sinisoftware.com/
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