Are you able to see the imported symbol in the library ?
At first I wasn’t able to see the imported symbol in the symbols pull down in the library. I had to restart the program and reload the project. Then when I imported the symbol it appeared in the library and I was able to use it in the project. I have had this happen a couple of time since then. All I have to do is restart the program. It is annoying but a bug I can live with.