Lack of admin privileges

I have admin rights. However, I am unable to proceed with adding plugins and updating WordPress with administrator privileges. How can I solve this? If you look at the screenshot below, you can see that the Add Plugin item does not appear.
https://yonsei-my.sharepoint.com/:i:/g/personal/bulebed1754_o365_yonsei_ac_kr/EW8Qyz45mbZMuhZnOLUUac4B1YVhZ3YRQXniLGvA82oCxg?e=LnnW12