So, yesterday you were able to find out a way around the Feature Image upload button issue by deactivating the child theme and switching to the parent theme.
However, I went back to last week’s backup database while in the child theme
Then I realized that some js files were minified and placed at footer. So I relocated the following files back to its original location (ex. From footer to original location)
Yeah, i had to write the second part of the post in a private post.
But yeah basically, on the mobile version, the button works on the page itself, but as a modal box, it is not working (see above private post).