The “Couldn’t upload to your” is a very generic message.
Have a look at this KB article. I would suggest you follow the steps outlined. At the bottom it explains how to get the publishing log files.
In any case if you want help on the fourn then more information would be needed.
https://help.realmacsoftware.com/en/articles/1905457-how-to-fix-ftp-publishing-issues
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