How do you send a link in an Instagram DM automatically?

Send it as a button rather than pasting the URL into the message text.

Both work, but they behave differently in the app. A raw URL inside a message is a long string the person has to tap precisely, it wraps badly on small screens, and it makes the message look like spam. A button card renders as a tappable label with your own wording, so "Book a slot" is the thing they see instead of a tracking heavy link.

The practical build is three steps:

1. A trigger that opens the thread. A comment, a DM keyword, a story reply, or a button tap from a previous step.
2. One message that says what the link is and why they want it. One sentence.
3. A button carrying the URL, labelled with the action rather than the destination.

A few things that change the outcome more than the copy does:

• Put the link in the first message of the thread when you can. Every extra step loses people.
• If you are sending the same link from several flows, build it once and call it from each, so a change to the URL is one edit rather than six.
• If the click is the thing you care about, record it as a conversion in the flow instead of trying to read it out of your link shortener later.

If this is for a comment to DM flow, the link belongs in the private reply, because that is the message that opens the thread and Meta allows only one of them per comment.