iPhone iTunes Other massive in iOS 15

:D Lucky you! :)

No iPhone here...

We cannot trust the Storage report as to where the usage really is, 4 suggestions, especially what “Other” is…

Have you emptied the trash lately?

Look for iOS backups…

/Users/[USERNAME]/Library/Application Support/MobileSync/Backup

OmniDiskSweeper shows you the files on your drive, largest to smallest, and lets you quickly Trash or open them.

https://www.omnigroup.com/more/

Purging local backups

Please note that although this doesn't affect your remote backup from Time Machine, this will get rid of the redundancy (at least until the next Time Machine backup) that a local backup disk will provide. If you need such redundancy or are worried about the recovery of your data then you would be best served to let macOS determine when to purge these files.

Start Terminal from spotlight.

At the terminal type tmutil listlocalsnapshotdates. 

Hit enter.

Here, you'll now see a list of all of the locally stored Time Machine backup snapshots stored on your disk.

Next you can remove the snapshots based on their date. I prefer to delete them one at at time. Once my "System" disk usage is at an acceptable level, I stop deleting but you can delete all of them if you want to reclaim all of the disk space.

Back at the terminal, type tmutil deletelocalsnapshots YYYY-MM-DD-HHMMSS , where will be one of the dates from your backup. This will be in the form of xxx-yy-zz-abcdef. Try to start with the oldest snapshot.

Hit enter.

Repeat for as many snapshot dates as required

http://www.thagomizer.com/blog/2018/03/27/cleaning-up-time-machine-local-snapshots.html

tmutil deletelocalsnapshots /  # deletes all the snapshots

Do you sync your phone with iTunes for music and podcasts? Uncheck the boxes to sync music and podcasts and the number should drop down to a normal range. I just had this same exact issue with the other space storage the same exact number. I turned off apple music sync on my phone, then removed the music and podcasts. The number dropped back down to a normal range. I'm running 15.0.2 .

Edit - actually the number popped right back up, so false alarm. I'm still going to go through with a restore to see if that helps.

I restore fixed it for me. I first backed up to iCloud, then did the restore via iTunes. First time I ever restored my iPhone 12 Pro too since I bought it last year. Had to jump through some extra hoops to keep my Signal chat history too - transferring to another iPhone temporarily before doing the restore and transferring it back to my 12P after the restore.

Hope this helps!

Thanks for stepping in to help! :)👍

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Thanks for the report! :)👍