I can’t seem to get a small png or bmp image to work as a thumbnail on my custom materials. I right click and “customize thumbnail”, pick the image, and nothing happens. Also, it would be very advantageous to be able to add a "subcategory” (for easy filing).
Thanks for the suggestion, we will consider adding subcategory.
If convenient, you can send PNG or BMP images to the support@d5techs.com so that we can test and troubleshoot the problem.