Hello @AbbieD,
Welcome to Klaviyo and glad to hear you have a Welcome Series flow set up for your subscribers!
As you mentioned, a Welcome Series flow is meant to trigger and serve a series/experience to customers who are added to a specific list. This flow would trigger whenever someone is added to the list by organically signing up to a signup form that is linked to the list, if you’ve imported a .CSV to the list, or even using the quick add function to add contacts to the list. This means that even if you were collecting subscribers in person, and importing the .CSV to Klaviyo or adding them on the fly using the quick-add function, these contacts would be served the Welcome Series flow experience.
Some things to keep in mind though is that contacts who subscribe organically would still need to confirm their double opt-in confirmation email prior to being added to the list to be served the experience if you have double opt-in enabled. Similarly, as a reminder, the flow would not trigger for contacts who are already existing members of the list or have already received the flow experience prior.
Another thing that is often times overlooked when attempting to link a third party or a Shopify provided signup form to a Klaviyo list is that the redirect for these forms are not set up correctly. If you were using a third party signup form, I would suggest using the instructions found in the How to Redirect Existing Signup Forms to Klaviyo Help Center article create such a redirect to a designated Klaviyo list which would trigger the welcome series flow for subscribers. If this was a Shopify provided signup form, you’ll want to enable the Collect email subscribers settings within your Shopify integration settings along with including the <input type="hidden" name="contact"tags]" value="newsletter"> Hidden Input Tag to the form itself to link it to the designated list. This is further explained in the Sync Your Shopify Newsletter Subscribers to a Klaviyo List subsection of the How to Integrate with Shopify article.
In addition to the following Help Center articles to get your bearings with understanding a Welcome Series flow, I would also encourage taking a look at some other Community Posts that touch upon this subject. I’ve included some that may be helpful for you to take a look below:
I hope this helps!
David
