WS2P sync does not work on nodes with a path in their WS2P endpoint
For example with this endpoint:
WS2P 90e9b12 duniter.g1.1000i100.fr 443 /ws2pDuniter will try to join wss://duniter.g1.1000i100.fr /ws2p. There is an extra space here which make the connection fail.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information