Hmm, still havin trouble. So in my texsrc folder, I should have(?) :
My new terr0001 .bmp
the same .bmp, but named ovl0001?
the same .bmp, but named ovl0001_a?
Could someone post an example of a correct texsrc folder if it had a custom tile in it please? Once I see how it should be, I'll be good to go. Thx in advance!