ESOS is basically a type of option given by your firm, and it is usually not tradable.

platforms like Moomoo or the traditional brokerage usually only engage in tradable securities like say Maybank equity shares.

So, when the ESOS is exerciseable, you notify your HR (follow their process) and then after some days, the shares will appear in your cds account. Some ESOS have option for you to cash out (ie the firm help you sell it).

Just be aware that you may get taxed on the capital of your esos on the year you exercise.