I just tested and it worked for me, except that there is a problem with the image. Maybe you did a mistake in the folder names, or maybe you didn't add the mod's name properly in Memoria.ini?
Anyway, Caledor, in-game, the chocographs are all white because there is no alpha channel in your .png and parts that should be transparent are white instead. I am pretty sure that the problem is the same when importing the texture through AssetBundleExtractor.