I tried accessing in the firefox and got the upload page in the browser ‘console’ atleast. Go to the general ‘uploads’ page. It will still show that you require super admin rights. So open the developer window (F12) and go to the Network tab. Choose the GET request related to upload. On the right side pane that opens, do an ‘edit and resend’, cin the Request headers, change the Cookie:user={super admin user id}. Clisk the send button.
Now you can see the Response tab of the same developer mode that you can see the actual Uploads Page with option to upload file #oopsie