I made a quick 1 min video as it will be easier for you to watch rather than me try and explain it.
Basically when i export/import these rocks i made in blender to UE4, the rocks import no problem but the textures on the rocks are gone and im just left with some white rocks.
How are you texturing the rocks in Blender? I assume using a texture. If so find that texture and import into UE4 then setup the material for that asset.
When i try and import the textures to UE4 its saying “The texture you are importing is not a power of two. Non power of two textures are never streamed and have no mipmaps”
I tried saving as all 3 file types you suggested and still i get that prompt.