Like creating decorated Minifigures, you can easily apply image files (.png files only) to a selected part. It currently supports 28 parts and will keep expanding its coverage. Once done applying and adjusting an image, choose either to add it to the viewport or export it to Studio.
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Unity only supports textures up to a size of 16384, even if maxTextureSize returns a larger size. You can only create a texture with the maximum size if you have enough memory. For example, you need 1 GB of memory to create a texture with a size of 16384, because the amount of data is 4 bytes per pixel × 16384 × 16384.