Not able to properly drape a raster image on a existing terrain

Hello guys! I've been trying to drape a raster image on a existing terrain. I exported a terrain from a file which was in a Tiff extension format. I did the assign material to "dcddrape" then after that I attached a raster image selecting "Yes" in the draping field. The procedure I took it is showed on the pictures below. If anyone could help me solving this problem, I would be very thankful. Thanks.

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