Important: Seamless mode is NOT for making non-seamless images seamless.
Use this mode when you already have seamless/tileable textures (like PBR materials, brick patterns, etc.) that you want to upscale while preserving their seamless tiling properties.
How it works: The engine uses 9-slice wrap-around padding to provide edge context to the AI model, ensuring the upscaled texture tiles perfectly without visible seams.