The pictures did not upload. Are you using a refrigerant recovery pump with the special tank for that purpose? Single use disposable refrigerant cylinders are not refillable. They have a check valve to prevent refills.
Have you purchased a supply of vacuum pump oil? After multiple purges, the vacuum pump will get contaminated with moisture and need to be replaced in order to get down to 100 microns or better.
Has the system been opened and exposed to atmosphere? If so, it will need to be flushed to remove contaminants. AC flush fluid is expensive so I used laquer thinner for initial rough flushing and finished with the AC flush. The good stuff apparently doesn't leave any residue.
Perform bench testing of the expansion valve and POA. The expansion valve has a factory mesh screen that is likely partially clogged and need s to be flushed and blown out. The POA needs to be checked. Bench testing instructions can be found on YouTube and other sites. I can provide some details if you have trouble finding info or making adapters.
I'm glad you have a new drier though if the plugs are out, you'll probably need another if it's been exposed to atmosphere for a long time. New driers are supposed to be compatible with both R12 and HFC134a. (XH9 dessicant).
Have you considered rebuilding your A6? Replacing the seals isn't too hard and you can use the new double lip shaft seal which is an improvement over the original ceramic seal.
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