I haven’t experienced that problem myself, so I don’t know.
Going by what another poster said here: Imported Assets - no texture on BobbleMarine-Body
Posted By vegetarianzombie:
There are two ways you can fix this. The easy way is to simply start over with a fresh project and see how the model imports, making sure you follow each step at a time.My guess is that you imported the models but forgot to import the texture. You must import them all at once.
If you are unable to solve the issue, keep reading to chapter two and look up the section “Fixing the Models”. You’ll need to create a new material, assign the texture to it, and then manually add it to the model.