tileset not working in offline editor

[GULTHEX]

ok im doing addtiledef miltest1,,;

and then like the screen gets glitched up the colors and stuff

you know what i mean

i put it in like every graal foldier and it still wont work

it only works in gif format

for soem reason the png format wont work

can sombody help ty

edit:

i forgot to tell you i did add the png to the end of it