[Map] Issue with corner tiles when adding in new tiles

[KingJester647]

I've been messing around and practicing adding new tiles into advance map and putting them into a map. The tiles themselves are fine, but I haven't figured out how to do the corners yet and after messing with flipping around sprites and such, I've gotten nowhere. (SS below)

Spoiler:

Obviously this doesn't look very good, so is there a way to make a sprite for these corner parts with the following tiles?

Spoiler:

Sand Path:
Water:

I've also tried replacing the default tiles with the new ones but the corners still end up getting messed up.

 

[Asith]

The tileset you're using simply doesn't have inverted corners. If you want those types of corners, you'd have to use a more complete tileset