I then designed a simple computer monitor model in Blender split into two objects: one for the glass part of the screen, and another for the 'rest' of the monitor exterior case. I saved a copy of the .blend file into the Assets folder and imported this into Unity.
When I try to apply the Render Texture onto the screen object, the texture is rotated 90 degrees anti-clockwise and is too zoomed in: I can't seem to rotate the texture so that it is the right way up to read the text, and only some of the text is visible. I have tried rotating the object 90 deg. clockwise in Blender and "applying" the transform so unity then thinks the object is oriented correctly. this still caused the texture to be rotated.
I also tried exporting as an .obj file, with "Up" set to "Y-Up", but this didn't work. I then tried applying the Render Texture to a material, which I then applied to the screen object which didn't work either. If I apply the texture to a standard cube in Unity, it works fine and is rotated and scaled correctly to fit the cube.
How can I get the blender object oriented correctly so that the Render Texture applies in the correct orientation and scales so the whole of the Render Texture fits and is not zoomed in?
I'm using Unity 2019.3 and Blender 2.82.