sorry for ask here but I don’t want to create new topic 
and my issue also similar
I follow option 2 in this guide:
How do I configure my devices to use Pi-hole as their DNS server?
Everything go well but I want to ask about upstream dns of pi hole, the guide said that I must use router ip as upstream dns of pi hole. But I tested with 1.1.1.1 as upstream dns, it’s ok, so what is the difference?
Both is OK. You can use any upstream DNS for pihole as you want. It can be your router, one of the list or one you enter manually.
Add
If you enter your router, make sure the upstream DNS server for your router is not pihole - this would create a DNS Loop.
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