@jimdunn I beg to differ! SSH CAN be jailed too, but it is a lot of work to do it. You seem to confuse two things here:
-“FTP over SSH” - this shouldn’t be used; in fact you are logging in SSH, on the same port used by SSH, and yes there are difficulties to configure every user and group; in fact this function it is better to be disabled in SSH!
-SFTP “Secure File Transfer Protocol” as the SFTP module for Proftpd; the FTP server (Proftpd) can be configured (easily) to use SFTP, on a DIFFERENT port from SSH and FTP; there are no problems here as it respects the way (FTP or FTPS) it was working, including user access and rights!
-sometimes people often confuse the previous two (not your case, but sometimes it happens) with FTPS “File Transfer Protocol over SSL” - this is just FTP encrypted.
Please read again my post, I edited it to be more clear! And in fact I mentioned the user access problem a few times deliberately…