(Unity version: April 2017 2f2unity later compatibility issues:The default pipeline of 20182019 is supported;Custom pipeline is not supported, HD is not supported, and lwunity is lower. Compatibility problem:Shader and related files can be used directly in 2017 version, but prefab cannot be opened, U3D, 5 X does not need to try. It does not support rendering pipeline. The default rendering pipeline does not need to be configured with high-definition or low-definition pipeline)