> thanks jacadcaps for the mention of the upcoming
> v3.12 release and that this issue is likely fixed with it.

As I understand jPV's reply, jacadcaps' reply was based on a misunderstanding, confusing SFTP and FTPS.

> Transfer did work before they migtaed to TLS, and maybe that's
> not properly enabled with the current version of Transfer v2.5,
> as it also worked with AmiTrade Centre, but neither are
> working / uploading / accessing the files at the moment.

As jPV said, current Transfer version does not support FTPS, just like ATC.