I am the owner of the site but still it says " Contact the site owner for permission to access the Media Manager." Don't know what to do... Any idea?

Question:
I am the owner of the site but still it says " Contact the site owner for permission to access the Media Manager." Don’t know what to do… Any idea?

Check the users and permission in the settings(you can use the search bar) and see if there is any co-owner. Have you got the site as a transfer?