I imported a model and it has 17 textures, 8 of which are missing and useless anyways as they arent visible on the model. That brings it down to the limit but idk how to remove the missing ones.
In order to get rid of the useless textures on the model you need to remove them yourself with a modelling program such as Blender.
There should be several tutorials and pages online about how you would go about doing this