macOS Server 5.4 - missing File Sharing for iOS (introduced in OS X Server 5.0 & El Capitan) 
https://support.apple.com/en-gb/HT207828
https://support.apple.com/en-gb/HT207828
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File Sharing in macOS High Sierra kills macOS Server
- Thread starter Geeky Chimp
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Yep. See my horror story here: https://forums.macrumors.com/threads/macos-server-5-4-file-sharing-difficulties.2092675/