Thank you so much! sorry to keep asking questions, i've been figuring more out slowly, I was wondering if your sandbox plugin was only designed for 1 layer on top of another, or if you can add more, as in im trying to make a sourcemap for say a window on a wall, and then maybe some flowers or vines you can then place over top of that window on the wall with 3 layers total? This is an amazing plugin to anyone on the fence about it btw^^
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Don't worry asking questions, I really appreciate them! They tell me that you guys like my stuff :)
My plugin does not add a "new" layer, that would be too complicated. Instead, I designed it to follow RPG Maker's 6 layers world (i.e. A lower, A upper, B lower, B upper, shadows, region tiles).
I briefly tested this pattern, and it worked for me. I was able to first build the window (line 6), and then the flowers (line 7) on top.

Tell me whether this fits your needs!
Heres an example im strugglin with, the first layer I have walls, the 2nd is the window/variant for each wall/window, and the 3rd layer id like to allow to place the vine overtop of the window for example although its not allowing me too haha, Im confused what I did differently compared to the source map you sent a bit ago

