I want to build some levels (rooms) for my game but i didn’t make tile map yet. I want to build my level using placeholder images and when i make tile map i want to replace placeholders with normal tiles. But how can i replace all tiles without destroying the scene?

I tried to replace source image of tile map and each tile individually but it just destroys all tiles and forces me to draw it again. I tried to find answer on the internet but i only found two post where first one was without answer and second one didn’t work for some reason.