Draping an aeral photo over a dtm mesh?

I tried to drape a georeferenced aerial photograph over a DTM mesh following video tutorials but didn't succeed. I wonder what I did wrong:

1. I attached the aerial photo as raster reference and ticked on 'draping' from descriptions

2. I created a new material palette with a new material called 'dcdrape' and selected special/dcdrape for the pattern map

3. Then I assigned the material 'dcdrape' to my terrain mesh and turned on quick view mode illustration

4. My DTM mesh stays gray. The areal photo is not draped over it

I am using Microstation 2023 (

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