To help you with this issue I need to check your FTP+wp-admin. Please provide your FTP+wp-admin login details to move further with this issue. Don’t forget to mark reply as private below if you share any sensitive data.
Permissions and ownership are important.Please make sure you have enough file permission for the plugins folder. The correct permission should be 0755 for the folders and 0644 for the files and ownership should be www:data. Please ask your hosting manager to help.