Hi Mijbel - this is because the AppsFlyer source is not added to the source definitions that determine which sources are available in the UI.
I'm opened a draft PR (
#11455) to get it added to the source definitions. I know the changes needed based on Step 11 in
this guide. However, I'm struggling to get the source to show up locally, hence the draft PR vs. regular PR. If anyone has ideas on how to get this over the hump, or if you're able to see the source locally, please let me know.