Q: A user only gets a reply once, even after commenting on multiple times with qualified keywords

​Ans: For a user to receive a response more than once in a template, you need to enable the "Do you want to send reply message to a user multiple times?" option.
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Q: Can I reply with Images or Videos?

Ans: Yes, you can reply to comments with Text, Images, or Videos

Q: Can I send a private message to a commenter after replying, hiding, or deleting their comments?

Ans: Yes, you can send a private DM to a commenter. And you can also reply with a chatbot flow where they get to interact with your chatbots or AI.