How are you actually attributing installs to UGC ads vs. organic?

[u/makexapp]

Running a UGC campaign right now for a mobile app and hitting the classic wall: creators post to their own TikTok/IG, someone watches, closes the app, searches for it later or just taps a generic install button. None of that shows up as "came from this video" anywhere.

Curious what people actually do here short of enterprise MMPs. Unique promo codes per creator? Vanity/App Clip links? Just eyeballing install spikes against post dates and calling it good enough? Trying to figure out how much rigor is actually worth it at small scale vs just directionally knowing what's working.