actually they are synonyms, but сейчас for official cases is more convenient

теперь - presently сейчас - now

This video is interesting and useful. But I don't completely agree with it. Don't look for difference between these words - for the time being.

thank you penthesilea!!! it was ver helpfull.

Anna made a great video explaining the difference : https://www.facebook.com/annateachme/videos/554649201359539/