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Help! How to find function name in native lib

You could try looking at already existing tutorials before asking I guess.
 
In general, sub_xxxxx where xxxxx is the address of the function, and if you do not want to make problems for yourself and look for it for a long time, Il2CppInspector has a built-in function for creating a python script for IDA PRO to generate all the function names, or use a specific IL2CppDumper that does the same.

Your tutorial for the lib that contains function name. Not work on my case.