Hey eubod214,
Yes, it is possible to change the file permissions with your file manager.
To change the file manager permissions you need to use FTP or Cpanel. By using this you can reset or change the file permissions with your file manager.
Also, if you will face any issue we would request you to log a ticket on our support desk: https://filemanagerpro.io/contact.
Our support team would like to assist you with your query.
Regards,
Support Team