Upload buttons in the “Theme options” menu are NOT working

Hi, im trying no update my site , and i cant use any of the UPDATE buttons in the “theme options” submenu. I click them, but they do not do anything. Please help me. (wordpress version 5.6.1)

I’ve loaded an old backup of my site in my own computer, and in the old version I was using at the time (wordpress version 4.9.16) the buttons does work as intended. It seems one the these updates in wordpress itself broke the buttons.