Upload feature doesn't work properly.

I am using a theme called Creative by Nature. The feature that uploads pictures, music, video etc, for lack of a better term, doesn’t work. I need to open it in a new tab, nothing happens when I hit the icons above the post composition field. I can enter information into the fields in the prompt to upload media, but nothing happens when I hit upload.

I’m sure there is something wrong with the theme, everything else works fine. I didn’t touch any of the related files as far as I know. What I am asking is that can I upload a cleaner file that would make this feature work?

Add post/page feature for this theme is kind of bare compared to other themes I use. I pretty much have to write all the HTML into the field.

This is a lazy person’s question, I don’t really mind writing the HTML to insert the pics etc, but I really want to start posting more frequently, and obviously this takes up a lot of time.

The moral of this story is what is the file(s) that control the Add page/post feature? Can I upload one from another theme? What would I have to change in the code of the other files to make this work?

I hope this makes sense and thank you for your help. Here is the site I am talking about: https://www.meghanchiampa.com