Yes, the Canon EOS R50 is compatible with the Samsung PRO Plus 256GB SD.
Canon EOS R50 requires UHS Speed Class 3 (U3) for 4K at 120 Mbps. Samsung PRO Plus 256GB is UHS-I U3 rated — meets the requirement. Camera slot is UHS-I only; UHS-II is not required.
“Canon EOS R50 Reference Guide: recording media is SD/SDHC/SDXC with UHS-I support; 4K UHD IPB at 120 Mbps recorded on single UHS-I slot.”
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Confidence: inferred