Auto replay to comments inside my FB group

Hello.
I can't make it work for auto reply to comments inside my FB group. Do you have any video tutorials?
So let's say when I post "who wants free PDF" when someone makes a comment yes, me or any words, pabbly would create a reply to this comment with "you can download PDF here + URL.
How can I make this work

thank you

Hi @milek,

I'm afraid that the use case you are describing is currently not possible. There is no action or event available to reply to a comment on your Facebook group post

Is any other option to engage or send link to someone who make a comment. Like private message or something else?
Thank you

Unfortunately, that is not possible either.