Aligning surface on imported object

[HarrietG]

Hi there! I'm trying to align a surface on an imported object to display some 'artwork'. 

So far I have created the surface texture (an image of artwork) dragged the .skp file of the artwork and frame to my floor plan, converted to morph, saved down as new object and added back in the surfaces. Whenever I do this the surface image won't centralise to the object.

I have tried Document > Creative Imaging > Align 3D texture (not an option as greyed out)

I have tried Align to surface constraint in Drafting Aids, after a couple of clicks on the object it just resizes it - I could be missing something here?

I have also tried adjusting and rotating the image, object and surface, all with no luck. Something I'd imagine to be fairly simple is proving incredibly hard!

Another conversation in here mentioned adjusting the properties of the object, is it possible or too complex? It's something that I frequently struggle with in finishing a project in the Interior Design side, and I would love to have my 3D models as realistic as possible. Am I biting off more than I can chew? I realise this is very advanced use of ArchiCAD!

Thanks so much!

Operating system used: Mac Intel-based