Songs from iTunes won't copy onto iPhone?

Every time I click "Sync" on iTunes a pop-up comes up; "Some of the items in the iTunes library were not copied to the iPhone because they could not be found."
It plays the songs that were "not found" in iTunes, but not on my phone.

WELL YOU COULD EAT YOUR IPHONE. I FIND THAT SOLVES MOST OF MY ISSUES.

Oh that's an easy one! This used to always happened to me. (i don't know why i'm so excited… Sorry) So basically when you download certain songs/albums online without paying, itunes is like wtf, i don't remember you buying that. And thats why you get that sign. Basically to shorten this one up, you either need to redownload (one time use files) or re open em. So for ppl like me using windows, click start, and type in the thing you wish for.ex: Drake, Knives and pens, All hope is gone (artist, song, album) just search it

Instead of syncing, try setting the iPhone to be manually managed for music and video - then just drag the files from the iTunes window onto the iPhone tab on the side of the page. I've owned iPods of one kind or another for over 6 years and I've always put music on that way - never synced.

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