"Deleted" music album on my iPhone can't be restored
I was trying to load a few albums from CDs onto my iPhone. I ripped them to iTunes as usual, then dragged the album to my iPhone icon. Everything went fine, and the songs were available on my phone. However, I noticed that iTunes had not automatically loaded the album artwork. I selected (via right-click) "download album artwork" and got it into iTunes. However, dragging the album onto my iPhone icon again did NOT bring the artwork to the phone. (In hindsight, I think it might have worked if I had waited a few minutes, but that's moot now.) I thought the only way to get this to work was to DELETE the album via my phone's iTunes' menu, which I did. Now I do not have the album on the phone anymore, but iTunes on my PC still shows that it's there. If I try to drag the album to the phone icon, the box around the icon flickers a couple of seconds but nothing else happens. If I look at "Music" on the phone via iTunes on the PC, the songs still show up, but I can't delete them from there and I can't (via right-click) "transfer onto device" either. How do I get iTunes and/or the iPhone to accept that the songs are not on the phone, so that I can re-load them onto it?
iPhone 5s, iOS 12