While the USB floppy drive will wok on High Sierra, it's not happy reformatting drives, that's best done on the "Wee Beastie" (my 12-in 2005 G4 PowerBook). That Mac has AppleWorks 6.2.9 on it, just for a fiddle, I copied & pasted an rtf doc into AppleWorks & saved it to the floppy drive as a .cwk document. I then connected the FD to the MacBook Air and tried opening the file with LibreOffice Vanilla. It worked perfectly.

While the USB floppy drive will wok on High Sierra, it's not happy reformatting drives, that's best done on the "Wee Beastie" (my 12-in 2005 G4 PowerBook). That Mac has AppleWorks 6.2.9 on it, just for a fiddle, I copied & pasted an rtf doc into AppleWorks & saved it to the floppy drive as a .cwk document.
I then connected the FD to the MacBook Air and tried opening the file with LibreOffice Vanilla. It worked perfectly.

2017-11-14T11:30:38Z