Map Maker troubles

[captc]

So I've been looking around, and I can't seem to find anything on the Help section o_o

but, I'm trying to create a map, my files are inside the 'terrain' folder inside media.
C:\FeralHeart\media\terrains\Clans

I have the terrain .png file and the mask .png file

clansterrain.png and clansmask.png

when I go into FH, though, and I try to change 'defaulterrain.png' to 'clansterrain.png' it says "can't fine clansterrain.png'
and it doesn't show up as a file, like watermill, that I can load up to the map maker. I'm not sure what to do o_o I've tried youtube, but can't find an answer, could someone help me?

[Varagena]

The file name is case-sensitive.  That's the only thing I can think of that would be an issue.  Also, make sure you spelled it correctly. 

[captc]

The names match, and spelling is correct.

[Varagena]

Then I don't know.