I'm kind of confused by this question. Same steps in the appearance section. Make sure you have your material panel opened all the way. If the section has color options change it to image. Because some materials have different default intrusions they don't always have bump or density to change. I'm not sure how to create base model materials for Fusion 360.
From there you can apply the texture. Considering I am using a ratio 1:1. They're just squares. And the colors don't come out right. Double click on the selected image. Here you can change settings. In my project it's important to change position offset, position rotation and just the scale(size) in the texture editor.
Since I'm using a demonstration. The scale is easy. 100mm by 150mm for the entire texture.
Compliments on trying to get something like this done. The texture is ready. Except this is the setting for the x and y coordinates of the model. I'm not sure how Fusion 360 handles mapping at all. As far as it decides where to put the texture. I rotated the position 90 degrees. And assumed the image starts at the top left corner. The texture size will also float the position on the placed z axises. The starting position changes there and handles separate from x and y.
However, the x and y can be resized with the texture in place. This is in no way an idea way to manage textures. And, I would just recommend using surfaces on the demo model. If the surfaces are possible to conform to the model dimensions. The thinnest base of coat of paint on F1 is approximately ^/*0.023 millimeters on areas. The texture should also be saved in the F3D model material.
