On my Note 20 Ultra, when the keyboard is open, clicking the 3 dots in the toolbar presents several options. One of those options is the Clipboard.
Can you check the same on your phone?
Clipboard is in the edge panel. You can get it from Samsung store. You may need Good Lock app from Samsung store to access it
More on Edge panel https://www.samsung.com/au/support/mobile-devices/using-edge-panel/