I'm working on a project where I need to export a Blender model to a Gazebo model. I am able to do that, but the textures are not showing in Gazebo. I'm using Blender 2.82 and Gazebo9. To my knowledge Gazebo can read .stl and .dae files.
by textures if you are meaning the materials they don't render in exported objects(read why: .fbx export why there are no materials or textures?) otherwise textures as images shoud should show up.