Cannot Upload or Search New Themes after 5.5 update

Hey there, I am hoping someone here can help me. Since the 5.5 update I cannot add/upload a new theme, I also cannot get the editor to work with the Elementor Plugin (might be theme related). I had purchased a premium theme so I could move up from the basic one I used to set up my site initially, and when I go to Appearance, Theme, Add New, it takes me to a page with an Upload Theme Button. When I click on that button it does absolutely nothing, I tried right clicking on it as well to see if it gave the option to open in new window, I have tried different browsers, and still nothing. My blog page disappeared from my website with the update, when I go to customize appearance of the current theme, managed menus, it says the page is invalid and it freezes the menu customization page. I am getting super frustrated with this, and really need the functionality back. As a photographer, my website it where I get most of my client inquiries, Please help!!!

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