You are dealing with a 'sealed system' and should never be 're-filled' unless the leak is found and repaired/replaced. To ad refrigerant to diag leak would require the proper low side tap.
How do you know it is short? In most countries it is against the law to just refill the refrigerant you have to find the leak and fix it make sure it holds pressure then u can weigh the exact amount into it. You also have to Vac out the system before adding referigerant and also change the filter dryer if the system did indeed go short of gas
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