Regarding export

Thank you again for this great tutorial. Great value for  me! 

Beginner question: I'd like to know what path should I follow in order to be able to export this mesh. Namely for Meshlab or Sketchfab, so that their interpreters can display my textures/materials. I tried to learn from here and there but I couldn't find a straight forward answer. Because when I export it does not consider the painted texture we've made in this tutorial, only the wood and metal materials. There must be something in plain sight I am missing. 

Thank you again!