Does helloly support “Session Resumption” for FTP connections?

helloly supports the secure connection via FTPS, but no session resumption. The FTP login itself is encrypted and secure. This cannot be changed.

If you want an even more secure data transfer, we recommend using SFTP (FTP over SSH).

Otherwise, you can check Always allow insecure data connections for this server in future sessions. in FileZilla's Insecure FTP Connection dialog box to prevent this warning from being displayed in the future.

Our experience shows that a secure connection via FTPS offers good protection during data transfer.