you need to force the camera to use "PROT P" on your server
How do you do that?
PROT subcommand is sent by FTP clients (Reolink camera), in FTPS mode the camera still sends `PROT C` (unencrypted data connection), which would simply get refused by FTP server requiring TLS on data connection when the camera tries to use the data connection. It seems like Reolink did not implement FTPS properly and created a false impression that the connection is encrypted but video / picture in FTPS mode is available for everyone to see, which is very bad.