I changed the thumbnail and/or name of my virtual tour. Why do these not change in the tour posted on facebook?

The information in your facebook posts does not adapt automatically. You have to help facebook understand that there was a change in the source: Therefore, go to the following link , insert the URL of your tour and click on "Debug". Then click on "Scrape again" – that's it.

Previous I can't understand why, on online tours, when my tour starts I don't hear the audio. How can I solve this?
Next I want to host on my own server. What specs should it have?