The FTP server I'm using (a ftp.box.com account) supports MD5 / MMD5 according to the FEAT raw command output:
211-Extensions supported
SIZE
MDTM
LANG en;zh-tw;ja;is
MLST Size;Modify;Create;Type;Perm
AUTH SSL
AUTH TLS
MODE Z
UTF8
TVFS
MD5
MMD5
MFCT
MFMT
211 End
Documentation for the commands is found here: tools.ietf.org/html/draft-twine-ftpmd5-00
Is there any way I could use these commands in the Synchronize tool (for the comparing folders/files quickly)? Being able to utilize the server-side calculated MD5 checksum would speed things up tremendously I believe as I would no longer have to download the files to do the comparison.
(If not with the Synchronize tool, is there any alternative way I could get the MMD5 extension working with Directory Opus 12.3 for remote file/folder comparison? I actually can't find any third-party FTP tools that support using MD5 comparison (only CRC or binary,) and my server doesn't support XCRC, unfortunately.)