I'm trying to set up my new Plus 2PM using https://kb.shelly.cloud/knowledge-base/shelly-plus-2pm-web-interface-guide . It's my first Shelly device. I can access its hotspot and went to settings/wi-fi. I selected my wi-fi network and typed its password. I selected enable w–fi network. I clicked Save settings. It said it had saved. But the shelly doesn't appear on my network, and neither does it display an error message on the settings web page. Now it sits there on the settings page saying 'LOADING NETWORKS'. So what does that mean? How do I set up this device?