Just in case anyone else comes across this topic... My issue was that Other System Data was forever growing and taking up every little bit of space I had. Turns out for me it was the OneDrive app ....however under iPhone Storage apparently OneDrive was only using a few MB's?? Even when I went into the app it only showed a few MB's. I only have 9GB stored in OneDrive so not sure why it was taking up over 36GB on my device?? I had to use a third party app to check called iPhone Cleaner, did a quick scan and deleted the OneDrive app from my device ...I got my free space back!! =)
Also I'm on iOS15 using on 64GB iPhone SE (2nd Gen)
iQue
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