Can't import content

I had just downloaded a mannequin from online, all of the assets being .uassets and .umaps, but when I try to drop it into my content folder, I get a million error reports.

When I try using windows explorer to drop it into the UE4 content folder, nothing happens.

It says stuff like “Unknown file extension ‘.umap’” or '.uasset."
What’s going on? Why is UE4 not able to import its own file type?

  1. Make sure that you use the same version of UE that the mannequin was created in.
  2. If you are going to drop it into the Content folder manually, make sure it is in the same relative place as it was in the project it was from (i.e. if it was in Contents/stuff/mannequin/ in the original project, make sure to make the stuff and mannequin subfolders and put it in there).

You cannot import a .uasset into UE4 because the asset gets converted into a .uasset upon importing. However, as has pointed out, with the Editor/Launcher closed you can move a .uasset to another project by placing it in the Content folder through Windows Explorer provided they are from the same Engine version.