Many features not working on my multisite wordpress.
1. When we go to customize and make some changes, the save & publish not working, its loading but not saving the changes.
2. For widgets, we cant add or remove widgets
3. can't add category
4. can't add menus
and many things happen
that just makes me stress
i host my WP on WPE(WP Engine), but they cant solve our problem
so please, i need help and its urgent for us
because of this, our students cant do their assignments
no changes they can make
video i made to explain the issue