Why doesn't autoplay work for Revolution Slider?

Question

WordPress

Revolution Slider does not work, a static image is visible instead of a video background. There is one feature, if you log in as an administrator, then the videophone works.
There are no errors in the console.
I foolishly bought the betheme theme not from the developer directly, but from themeforest.net - there the devil will break his leg in the interface to write to the support and get an answer, so I write here...

Answer 1

Is caching enabled on the site?
The very fact that the video is working as an authorized user may indicate that this may be due to the cache. True, not true. Eliminate this moment...
If there are caching and optimization plugins, disable them, if there are built-in utilities for optimizing the code in the theme itself, temporarily disable and check.
I don't know what's so difficult about themefores support... as for me everything is quite simple. In some themes (XStore), for example, there is a built-in tool like jivosite for communicating with the developer