Monday (12th February), Daniel Laera our developer has found the solution to integrate a real preloader on a Wix website. It works on all devices ! :-)
We are still working on it before to give an explaination to great youtubers like Nayeli for a more easier tutorial. It's not the most easy for a beginner because it works with external codes.
For the moment you can see a preloader on the website of our agency and on a test website :