I've had netguard on my Android 8.1 for a couple of weeks, and it's worked well. I'm using the github version to block ads via host file domain filter. Yesterday, I noticed that google photos was complaining about "waiting for wifi" in order to backup my photos. But I was on wifi. So I disable netguard via the main switch in the upper left of the main screen. That allowed google photos to backup files again.
I'm unsure how I screw up netguard settings that it started blocking google photos, so I'm here to ask a couple of items that I suspect may have caused it when browsing through the settings:
1) Under Netguard>Settings>Network Options: I have both "Lockdown Wi-Fi" and "Lockdown mobile" in the on (red) position. I'm not sure if "lockdown" means the same thing as the Enable/Disable button on the main Netguard page, but giving you finer control over global wifi vs cellular settings? I forgot what state the lockdown options were in when I had things working. For "normal" firewall and ad blocking, do you guys have lockdown enabled or disabled?
2) Under the Android VPN settings, I have two VPN's. Google's Wifi Assistant and Netguard. Under Netguard's Android VPN setting, "Always On VPN" is disabled. I think that's the way it's always been.
3) Maybe my host file is blocking Google photos uploads? If I leave the Netguard firewall switch enabled on the main netguard page, but in the advanced settings, I turn off filtering in the advanced settings (the ad blocking by domain feature), then google Photos resumes. This makes me think it's the host file has an entry for google photos in there.
4) Kind of random, but I noticed in the "Pro Features" menu, at the bottom, there is a "challenge" field follow by some random letter/numbers, and a response field for entry. I didn't notice this before, and there's no label to indicate what this weird thing is for.
The challenge code is to enable the pro features, which you can get as a "thank you" after donating.