What I did to get textures converted when cloning a level to make a new map.
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Published on ● Video Link: https://www.youtube.com/watch?v=X1RpKaUFZYI
With using a new terrain block.
I got to say this is likely off in some places because no 4 videos where same result. Mostly when importing a terrain, I had crashes and less if I just created a new terrain with the tools. (that one is small)