Why don't my local files save to my iPhone anymore?

[xyrisse]

I don't know what happened, considering I decided to switch to Spotify less than a week ago. I googled how to get my local files on my phone by syncing my Mac and my iPhone and pressing save on my iPhone when I play the song on my Mac. Simple enough. 

Except it's not working anymore???

The local files do show up on the desktop app on my Mac and it plays on my phone, however, when I press the three dots and then press save to save a song, the song isn't saved or in my list of songs but for some reason Spotify thinks it is??? Like I'll attempt to save it again but it'll say remove but the song isn't there??? I've reinstalled Spotify and everything too. It's actually pretty disappointing considering I was excited to try out Spotify than Apple Music. Anyway, help is appreciated. Thanks. 

[user-removed]

Hello, Help arrive!
If you are experiencing:
A. Grey title in Playlist
B. Cannot play mp3/m4a on iPhone

Please make sure the songs import into Spotify:
a. Not protected by DRM
b.In supported format (https://support.spotify.com/us/using_spotify/features/listen-to-local-files/)

Steps:
1.Make sure your computer and mobile devices (iPhone) in the same WiFi network.
2.Remove the playlist which you find the problem
3.Remove and re-add the "Local Sources" - Make sure all songs synced.
3.1 Reopen Spotify app (MAC) [in case if you added too many songs] [Recommend to do]
4.Make sure all the songs which added can be played in Spotify (Mac)
5.Make whole new playlists (Recommend using different name from preventing sync error)
6.On Mac, check all the songs in playlist whether they can be played or not.
7.Download playlist on your devices(iPhone)

Please let me know if you have any questions.