Whenever I try to drag and drop my psd file into the panel it displays a red circle with a line through it and refuses to let me. When I try to go through import the psd file just doesn't appear at all and the dropdown menu displays that it is looking for .wpk files. I'm not sure what those mean and how to fix it. Is there anyone that can help me? I spent so long drawing the stupid model and now it won't even let me use it!