I have a pi 3b+ and have downloaded and flashed octoprint 0.16. I edited my wifi ssd (no password on my network) just like the read me said in theoctopi-wpa-supplicant.txt. I uncommitted the WiFi country and the correct WiFi settings. I did this VSC. I did this twice.
I am on mac.
When I plugged my pi in but when I go to octopi.local there is no connection. I used a hdmi cord and can see no urls under
"You may use a web browser on a local network...."
I plugged my pi into a Ethernet cable and I see 192.168.0.22 and a IPv6 address.
If I go to 192.168.0.22 it is the octo print set up.
Why does octopi.local not work and why does it not work over wifi?
Leave the Ethernet cable in there while you're troubleshooting this.
Do a remote ssh pi@octopi.local session (password raspberry). Run ifconfig and see what's going on with the wlan0 adapter. It probably isn't connected to your wifi zone, doesn't have an IPv4 address allocated to it and doesn't have the RUNNING flag in that paragraph.
The guess would be that the work you did to edit your /boot/octopi-wpa-supplicant.txt wasn't happy somehow.