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>FTP client: technically, the tech is correct, you need an FTP client to connect to an FTP site. However, for many years some web browsers included varying levels of FTP support but that seems to be increasingly deprecated - I believe Google Chrome for one just dropped FTP support after threatening to do so for some time. That said, I understand you can get extensions or plugins for major browsers for FTP support. Still, it would be a pain if your customer had to install something like that just to upload a file.
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>Your site may have another option named something like "HTTP/HTTPS transfer/upload" etc. If it does maybe you need to enable and configure that, it might give you what you're looking for.

Perhaps only PURE FTP is/was disallowed during the purge on unenvrypted access.
SFTP:// or FTPS//: might still be supported,