To customize a leather planner with your already-design files with YUHE, follow these steps:

1. Choose your planner: Browse YUHE's selection of leather planners and select the one that best suits your needs.

2. Contact YUHE: Send an email to YUHE or use their online contact form to start the customization process.

3. Submit your design files: Send your design files to YUHE in the appropriate format required for printing. Make sure that you have the appropriate rights to use the designs and that they are in the correct resolution and size for printing.

4. Finalize the details: Work with YUHE to finalize the details of your custom leather planner, including the cover material, binding type, paper type, color, and any additional features.

5. Confirm the Order: After finalizing the design details, confirm your order with YUHE.

6. Receive your customized planner: YUHE will create your custom planner according to your design files and specifications and ship it to you.

With YUHE's custom design services, you can create a personalized leather planner that reflects your personal style or brand. You can use your already designed files to add sophisticated designs that make your planner stand out. With the ability to add customized features, you can create a unique planner that works best for your lifestyle, business, or organization.