As mentioned in the title, I have over 19gb of storage taken up according to the iPhone Storage settings, as shown:
However, I have already deleted all my photos and videos in the "Recently Deleted" Album as shown:
I also tried to click "Empty" beside the "Recently Deleted" Album under the iPhone Storage settings, a loading circle appears but eventually nothing happens:
I have tried connecting my phone to my computer and the only photos remaining are the ones I did not delete. I could not find any traces of deleted photos in any folders.
My iPhone 6 is updated to the latest 12.4 iOS, although I believe the issue has already persisted for a few years, but I didn't give any thought to it until now.
Any advice or solutions will be greatly appreciated. Thank you in advance.