Textures should still go into the Runtime/textures/vendorname file path in a DS runtime structure.

eg My DAZ 3D Library/Runtime/textures/Vendorname/Productname/texturedif01.jpg.

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DS also has a pattern you would want to follow for where your content is placed in the content library structure to make it easy for users to access.

DS does use relative paths but there is still some order to where content needs to go in the content library.

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For example a little black dress for Genesis 3 would be saved to.

My DAZ 3D Library/People/Genesis 3 Female/Clothing/Little black dress

Materials for the dress should stem from there.

My DAZ 3D Library/People/Genesis 3 Female/Clothing/Little black dress/Iray Mat presets

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Hope this helps :)

edit: markdown for text formatting = fail...