why is there No navigation on the edge of an imported FBX model?

Development World Creation
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Hi JoSf:
Thanks for your reply!

When i import the FBX model into UE4, i checked the “Generate Missing Collision” is on(as in the following picture), but the problem remained.

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Then i tried unclicking it, i can surely enter the model area in ue4, but there is no collision as all, i.e, the character can walk through the walls. LOL

If you have some more advice, please let me know.

Thanks.