File under "just for the record" -- assorted weirdnesses encountered as my cloud library was stumbling into its existence:
I still can't figure out why one of my uploads occurred. I don't think I changed anything in the one track of an iTunes-purchased album, but one of its tracks got uploaded instead of just marked as Purchased. For the life of me I can't figure it out. I checked in my purchases for my account, and the entire album is still available for redownloading, so it's not like the original track "vanished" from iTunes because the rights holder withdrew liclensing or something, thereby forcing an upload.
Oh well. I'm just sayin'. If I see another one like that then I'll start doing some feedback to Apple. With this one, I can't prove I didn't somehow alter this one track's metadata, or do something weird like maybe buy that one track first on a mobile device and then transfer it to my iTunes library, and later buy the rest of the album from the iTunes app's store tab.
It should not make a difference to do that, but it might, I guess. Anyway I don't think that was my scenario. So I'm mystified. It's also remotely possible I first bought tracks from the album from iTunes before they did 256AAC and then I decided to get the CD and ripped it to AAC format, then maybe I completed my digital album purchase to get iTunes Plus format (remember they had some special offers for awhile like that) and then maybe I messed up when deleting "duplicates", leaving that one track in ripped AAC format at a lower quality or something, anyway it doesn't match, apparently, so it's an upload, reason unknown.
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I also have one ripped track of an album that was stuck on status Waiting for almost 24 hours even though many other changes were processed meanwhile. I don't know why that hapened. It's a Francis Cabrel track of an old CD, his Fragile album. The names of the tracks are in French. This track had a grave accent in the title, which was originally "Dernière Chanson". I noticed that for some reason it became Derniere Chanson when the CD titles were supplied, if they were supplied by Gracenote or edited by iTunes of that era, I don't remember. Anyway the song had no accent in it as of entry to my library a long long time ago. I changed it awhile back to have the accent, before I turned on the cloud library.
I half-wondered if it got hung up on Apple's censorship gig, i.e. did it think that "dernière" was a misspelling of derrière (one's behind, or butt) and translated it as "ass" and censored it?
Then I realized that was, well, a stretch. So I figure the upload failed on a net error.
Anyhow on the upload, it failed, all it said was something like "Error occurred" and a little yellow triangle or something popped onto the status like an asterisk, sort of, and the status went to Waiting. The yellow tag went away, I don't know when, maybe on relaunch. The library in the cloud had refreshed a few times since then but that one still said Waiting. I changed the title to "Dernière Chanson (The Last Song)" and it didn't even give that warning about how an upload was pending, it just took the new name even with status Waiting.
I think it just lost track of that error having occurred for some reason. Tonight I noticed it had finally uploaded with the name I had provided most recently. So maybe my net connection glitched when that track was going up before and somehow the error and the Waiting status cancelled each other out re further action. for quite a long time, through several times of being online or offline, and some app relaunches as well.