File explorer
Every server has its file explorer inside the panel. Browse, upload and download without installing a separate client.
SFTP
Available on any already-paired server. It uses the pairing key, not a password, which is why it only appears once the server has been through that step.
FTPS
Available on any server with a username and password, with no need to pair it first. It works in explicit mode over port 21, always passive.
Self-signed certificates are accepted on purpose: FTPS has no host-key fingerprint mechanism like SSH, and requiring a CA-issued certificate would lock out most real-world servers.
What counts against your plan
Each explorer tab keeps a session open against the server and counts as one connection of your plan, same as a console.