It appears that the only way to draw a raster image file to a map or scene using the ArcGIS Pro API is to create a raster layer of that file that will then appear in the TOC. Therefore if I want to draw several raster files I will end up with several raster layers in the TOC unless I first mosaic the files together into one which I don't want to do. Is there a way to do this without adding layers to the TOC? I was able to do this in ArcMap with ArcObjects in the context of drawing a custom layer which is also something that can't be done in the PRO SDK.
