Currently there is not a video tutorial on this, I will look into it. However, lets try to figure out your problem as I need more info on your exact issue.
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Are you able to load the AdvancedDecals demo map and see the correct decals when shot?
->If No, did you load the physics ini file
–>If Yes, are you able to see the correct Physical Surfaces under the “Physics” category inside of the “Project Settings” -
Right click inside of your level blueprint and type “Advanced”. Do you see the Advanced Decal Functions category?
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What version of the engine are you using? (4.6 or 4.7.3) Is it the launcher build or Github build?
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Can you explain your project setup a little. If its based off of one of the Engine Templates, which one?
If you can answer these questions, I’ll be more than glad to help you figure it out =)