1. Make the appendix into PDF file or picture format.
2. Upload the appendix content to the website or cloud hard disk to obtain the URL link of the appendix content.
3. Insert a hyperlink in the paper and link it with the URL of the appendix.
4. Make sure the URL link of the appendix content is correct, and click the link to test.
5. When submitting the paper, submit the URL link of the appendix content at the same time, which is convenient for reviewers and readers to check the appendix content.