How to get Iray thumbnails rather than 3DL thumbnails when saving a material preset
I rarely use 3DL for rendering, but I often save material presets and it is annoying that the thumbnail that is produced when doing so it is a 3DL thumbnail image. Since the material is intended to be used in Iray renderig, this 3DL thumbnail is totally useless as generally does not show the important characteristics of the material. The same occurs when saving scene subsets, pose presets, wearables, etc. The thumbnail is a 3DL image. Is there a way to change the default setting so that the thumbnails produced when savig presets are Iray images, not 3DL ones?

Comments
The standard thumbnails are OpenGL, not 3delight.
Unfortunately, the only way to make Iray or 3delight tumbnails is to render them and replace the thumbnail PNG with the rendered one.
the auto generated thumbnail is an opengl thumbnail, not 3DL
You generally need to make custom thumbnail manually, but I think there are products that do for you
There are also evidentally free scripts but I have not used them.
https://www.daz3d.com/forums/discussion/451746/free-script-iray-thumbnail-creator
Thnaks, very useful tips!