https://courses.reallusion.com/home/character-creator/cloth-and-outfits?v=character-creator-3-tutorial-creating-clothing-from-obj-files
I find this video, I need to create a cloth from an obj/fbx file.
FBX file is: https://www.cgtrader.com/3d-models/character/clothing/old-leather-coat

First probleme: can't select the obj file only the fbx file (in the video it is an obj file)
Second probleme: "the fbx key file path is empty" What fbx key file?

How can I import a downloaded obj/fbx as a cloth?

It sounds like you are not using the correct import process.

You have to select Create > Accessory from the Menu Bar and you can then choose either an OBJ or FBX file. If you use this method no FBX Key will be required.

For more information please click the link below.

https://manual.reallusion.com/Character-Creator-4/Content/ENU/4.0/08_Cloth/Creating_Custom_Clothes_OBJ.htm

                                                                

Peter
Forum Administrator

www.reallusion.com