Why can't FTP resolve host name?

I’m setting up FTP to access my remote files on my laptop, however, FTP cannot resolve host name. I know for a fact the name works as it can find the files in nautilus and using the ftp://not.giving.my.ftp.url.com in browser, but it always says it cannot resolve the host name.

How is the question related to LibreOffice? If you are setting up the access in it (something not mentioned), then which version? which OS? which steps you do (what in which fields in which dialogs)?

It is in LibreOffice. Version 6.3 and the other things are too prove it works. Ftp fields port 21 (as it is setup), Manjaro, and I’ve typed it in exactly as setup but LibreOffice reports cannot resolve host name