Thanks for letting us know here, about your device storage that are taking up so much space.
Clear Cache Partition.
Step 1. Turn off your phone.
Step 2. Plug in the USB cable via PC or Type-C earphones (in case its USB-C to USB-C).
Step 3. Then press and hold Power and Volume up buttons.
Step 4. Release the power button. When the recovery screen shows up, release the volume up button.
Step 5. Navigate to and select Wipe cache partition (Volume up and down is for highlighting options and power is to select).
Step 6. Navigate to and select Yes.
Step 7. Press the power button to select Reboot system now.
If that doesn't work, you can submit an error report through Samsung Members app as follows:
Step 1. Long press Samsung Members icon on Apps screen and tap Error reports.
Step 2. Tap OK on agreement popup to send system log data.
Step 3. Select Symptom category "Others".
Step 4. Describe the problem in details and SEND.
For more assistance, you may contact us on our online Samsung support channels below.
If the problem persists, immediately bring your device to the nearest Samsung Authorized Service Center. Rest assured that our Samsung Engineers/Technicians are competent to assess your device and offer solutions to restore it up to optimum performance.
The phone knows that much storage is taken, but it does not know how much storage each app takes.
After you tap the information button (i) and then confirming that you want to let My Files to access your app data, the system data would decrease to around 20 GB or less.