Can’t seem to solder vertical plug mount USB C connector
You should use flux and low melt solder alloy to make life easy for yourself.  Add flux and solder first, clean excess with braid, and then apply hot air to finally solder the connector in place.
Low melt solder is expensive, but you need a very small quantity. Do not use lead free solder as is a high melting point unless you really care about being rohs compliant.