Version: Xmind 8 PRO or later
1. select "File" -> "Export" -> "HTML File"
2. select "HTML file" export
3. Select format and rename the name
Rename Central Topic.html to index.html
ps：No matter what the file name is, rename it to index.html
4. The two files generated by the export are compressed together into a zip and then uploaded to wulihub