Get my terrain untiled?

Hello community,

Here is my first post ! I’m facing a noob issue, I’m very familiar with Blender and 3DS-Max but still learning UE.
I created a heightmap and imported it in UE, it has been tiled and it seems to work properly. I wanted to play around with it, render, then see what I could improve but here is the situation : I can’t find a way to re-export it from UE (I made some changes).

I can only get tiled TGA textures that I can’t open in blender or photoshop, it seems to be “broken”. I tried this solution with no result. If I can’t find any solution I’ll have to redo everything in blender then import again :confused:

Thanks for your help !