Send to Unreal - Collections | Unreal Engine
Send to Unreal creates several collections for you. These collections are important, and each name is a reserved name for Send to Unreal. The exact names are, “Mesh,” “Rig,” and “Extras.” This video gives you more information about it.
Here is the link to the full documentation:
https://github.com/EpicGames/BlenderTools/wiki/Send-to-Unreal-Collections
If you get a 404 error when you click the link above, then you will need to sign in to your GitHub account and link it with your Epic Games account. Here is a link to instructions on how to link your account:
https://www.unrealengine.com/en-US/ue4-on-github
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