iPod is recognized by iTunes but songs won't show up on device

I bought a brand new 32gb ipod touch 5th generation last weekend. I put about 8gb of music onto it. the music displayed under the "on my device" section of my ipod in itunes however when i disconnected my ipod the only songs on it were ones that were purchased through itunes. I contacted apple support twice and both times was told to restore my device and put everything back on again. the second time the process worked by syncing only certain artists/albums but not with single songs.

when i finally got it to sync (after a total of 8 hours wasted and 35gb of music added and removed after 2 full resets) some of the album art doesnt show, the song titles/artists don’t show up, it plays the wrong songs. all my music is tagged correctly and i cant figure out why this won't work. all the songs i added show up as "unknown title/unknown artist" yet when i click them they all play songs with titles and artists

i dont know why i cant just drag and drop songs like every other ipod i’ve ever had (a total of 5 over the years). if anyone can help me with this i'd really appreciate it. I've wasted so much time on this and apple chat support is broken right now