I was trying to find the list of supported formats in the documentation, but under the import category there is no mention of it (page: https://www.epicgames.com/fortnite/en-US/creative/docs/uefn/UEFN/criteria-for-importing-assets-in-unreal-editor-for-fortnite )
And the list of supported formats under the import button is not fully correct either, because even if some formats are shown, you cannot import them into the engine.
