Hi @tuanphan this code doesn't seem to work for me either. I am using version 7.1. Do you know why it wouldn't be working? Here is a screenshot of code that I already have input for another issue- this code worked fine. I have tried adding the code you posted below this code and I have also deleted the previous code and added the one you provided, but I am still not getting thumbnails on my mobile version. Can you help? Thank you!