Hi, im using pureftpd and i want to use encrypted connection, what certificate from what path can i use with that to have it with auto renewal? And same for email communication. Thanks for any help

I don't think those certificates are managed in froxlor. If you have your FTP server reachable by ftp.domain.com, I'd suggest to install acme.sh locally and generate a certificate for this domain and implement it into the pureftpd configuration. Maybe you can use pureftpd's mysql module to obtain the data from your froxlor installation but I cannot demonstrate how, it's just an idea.

Np, i found them in froxlor-custom folder and it works fine

Basically you take a certificate that matches the server name. If your Froxlor installation is in operation under a domain, you take the certificate from it, but the installation should also match the server name.