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How to set the cover size of WeChat official account separately?

The setup steps are as follows:

1. Prepare the picture to be used as the cover thumbnail, and make sure the size ratio is appropriate.

2. Log in to WeChat public platform, select "Content Management" in the left menu, and click "Add Graphic Materials".

3. Add a title, text, etc. In the editor, insert the picture you want to use as the cover thumbnail.

4. Click the Insert Picture button, and in the pop-up window, choose to upload a custom picture or select an existing picture from the material library. The combined cover horizontal screen and thumbnail are ready, and the whole photo exported after combination is uploaded directly as the cover thumbnail.

5. Adjust and confirm that the selected photos are displayed satisfactorily in the editor.