I am able to create materials, for the most part by searching for “tileable image” and going through the motions within the Materials Editor.
My problem: I have been given access to a company’s catalog of brick colour images and I have created two new materials from these images, but only by accident. I realize the pixel sizes have to be no more than 1024 x 1024 (?), so I save the image, open it with Paint, resize to 900 pixels (aspect ratio is locked, so the other dimension is what it is, but no more than 900), then I crop the image and save it to my Materials folder. When I open the Materials Editor, my newly adjusted image does not show up, even though it is definitely in the folder I choose, and it’s a JPEG, and it’s file size is below 1024x 1024.
I have been trying for hours to figure out how it worked twice, but not again. I can’t find any difference between my methods. I’ve even tried deleting the saved images and starting all over. Four times.