You are correct. This is internal physical storage. Thanks for posting the screenshot.
Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:
- Press and quickly release Volume UP button
- Press and quickly release Volume DOWN button
- Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF).
If the above does not resolve the storage issue then:
Do you have a backup created on iCloud or a computer? If NOT, then can you create a backupon iCloud or a computer?
My recommendation is that you 👉 Restore your iPhone to Factory Settings. Once that is done then 👉 Restore the iPhone from a backup.
The above process can get time consuming, however, may be worth the time to address this storage space issue.
Axel F.