S21 128gb FULL!

[whatthes21]

System shows using almost all 128gb on my phone. I deleted a few apps but only have 1.6gb memory available. Any suggestions?

[RedDogRabbit]

Backup your device with Smart Switch & Factory Reset. 

The System should be using way less than that. I think that it's likely that the My Files app & how it analyzes storage is not accurate, includes far more than Android's actual system files. 

The System on my S20 Ultra, is just over 26 Gig.

 

[bANONYMOU5]

Every time you do a system update, it keeps old files in the background as a fail safe in the event the update fails, it can roll back. The old files are never deleted. Usually a phone will have enough space that you can go from say One UI 4.0 all the way to 4.1, and at that point you should back up and do a factory reset.
I've made it a rule of thumb that every One UI revision (4.0, 4.1, 5.0, 5.1, 6.0) I backup and do a factory reset so I'm using the latest primary build on a clean install.
This also keeps the phone running better as there are no possible conflicting confif files from the older update that can cause stability issues.
Every OS is like this. You ALWAYS need to manually delete the old files.
On Android you can make a Google Backup, Samsung Drive backup is a lot better because it will backup third party app store apps, or you can use the Smart Switch app to make a backup saved to cloud storage or your computer.
On iOS or macOS you need to make an iCloud backup and then perform a factory reset.
On Windows you need to run Disk Cleanup as administrator.
On Linux you need to do it through terminal with sudo apt autoremove -y
Hope this helps