Trouble Importing Skins

I've recently been having trouble importing skins. I have TFT and have been using the import editor. I put the correct paths yet any skins that I have edited show up all balck or invisble. I've checked and I didn't mess with the alpha channels. Any ideas on whats wrong?

depends, if your trying to replace a skin, then take this for an example

I have a Footman skin i want to replace the old one with, so i use the import manager to open up the footman skin, then i double click on the imported skin and activate custom paths, then i set the custom path to
units\human\footman\footman.blp
now any unit with the model file units\human\footman\footman.blp will show up with my new skin, if you want to make it as a different model then you need to extract the .mdx and i'm not sure how to do that, somone will prob post here soon tho.