Meet a "Failed to read file" error when loading local terrain file

I’m trying to show some specific area in Unreal Engine,I have downloaded the area’s GDEMV2 30M data, and used CesiumLab to solve it.
When I trying to load it to the Blank 3D Tiles Tileset using setting of ‘from url’
I met the question of
LogStreaming: Warning: Failed to read file

Sounds like you’re running into this issue: