My Kenmore freezer does not freeze to top portion well

Brand: Kenmore
Model Number: 10650042711
Main Symptom: Freezing
What happens & when:

The freezer works well at the bottom but not at the top.

The issue might be the air flow.

Please advise how can I fix this issue.

Error Code (if any):
Parts or tests already tried:
Photos / video link:

Hello, when you open the freezer door you should hear the evaporator fan running. If you don’t it is probably bad. If it is running, there could be an airflow issue involving the return vent at the bottom of the freezer section, next to the evaporator coils. If the evaporator coils are iced up, there is a defrost problem.