The fastest way to solve this issue is for you to share one of those models so we can check what the problem might be.
I’m attempting to make a game using borrowed assets (since I can’t create any yet) and I found some character models that are almost perfect for what I’m looking for. My plan was to import the models into Blender and hope I could alter the models in order to make them look more appropriate for my game. However, whenever I select ‘import’ after clicking on any of the models and nothing happens. The application acts like I just didn’t try to import anything.