Hi I am currently working on an HDA to process multiple incoming 3d scan files and I'm having trouble assigning the right texture to each workitem. Ultimately I want to import the hda to unreal to automatically process hundreds of scans and assign the right texture to each one inside of unreal.

my current approach looks like this;



I am creating an attribute "extension2" for the texture files in jpg format
and then I feed that attribute with the rest of the filepath into the hda which is connected to my basecolor inside the shader of the HDA



What I don't understand is why the HDA processor seems to load the geo correctly with the expression but cannot do the the same for the texture files

Since I am a total beginner with tops and pdg I would greatly appreciate if anyone could take a look and help.