File Design Guidelines: 1. Avoid using large areas of dark color blocks on textured paper to prevent affecting paper texture or causing color powder drop and white spots. 2. If there are color bars/borders around the file, uneven margins will occur, which are visually noticeable below 2mm. 3. For colored materials, design the file with a white background. 4. For textured paper, the finished product's grain direction (horizontal/vertical) is random. 5. Image format printing effects are not clear, especially text parts, please upload vector files! 6. Paper color and thickness may vary slightly between different batches. 7. QR codes on premium materials are printed in black by default. Please inform customers of the above!