Hi @tommylam143 ,
Looking at the [https://www.searspartsdirect.com/model/2kt8z80xzl-001482/samsung-rfg295aars-xaa-00-bottom-mount-refrigerator-parts|parts] for the refrigerator, it has an evaporator unit in both the refrigerator section (part #19) and the freezer section (part #14-6).
Is the evaporator unit in the freezer compartment icy cold? Be careful if you go to touch it with your bare hands.
If not there is a problem in the sealed system.
How old is the refrigerator? According to the [https://www.searspartsdirect.com/manual/2kt8z80xzl-001482/samsung-rfg295aars-xaa-00-bottom-mount-refrigerator|owner manual] (see p.37) there is a ''Five (5) Years Parts and Labor Warranty on Sealed Refrigeration System Only* (*Compressor,evaporator,condenser,drier,connecting tubing)''