Wow, thank you for your fast reply Rambambulli!
I followed your advice step by step, in every configuration. Strange, but whatever I do I get black screen - I tried opening *.html file on IE, Edge, Firefox, Chrome, OneDrive on my iPhone 5s. Black screen everywhere.
My file that I rendered has a resolution of 5000x5000 px, its standard *.jpg file. File name is Corona_Panorama.jpg
I can send you my OneDrive Files if you want to chack that out:)
Thank you again!
Anyway, I'm gonna keep trying to make it work today.