"Unknown error" and failure to upload folders and multiple files at once in both Web UI and Seafile Client

Seafile Server
3

Finally I found the solution here: "Unknown erorr" and "Server error" status syncing libraries since Seafile Server CE 7.0.5? - #2 by saljut7

  1. Outside the container, add client_max_body_size 0; to every server { ... } block of the Nginx config file for the reverse proxy. Normally there are two such server blocks: one for port 80 and one for port 443.
  2. Test Nginx config and, if no error is found, restart Nginx: sudo nginx -t && sudo systemctl restart nginx.service
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