Can not edit Slider Custom Source

Hello and good day.

I have several of your demo themes which use sliders.

However, I can not click upload or edit any of the existing demo sliders.

The upload button does not work nor selecting any of the demo images.

Can someone lead me in the right directly of a resolution please?

Screenshot
https://drive.google.com/file/d/1xK2Bj695YpzU5WUZIE0YujpG3qzeQisW/view?usp=drivesdk