Is there a way to do a CTA at the end of your filter? Maybe something like a pop-up download here after your filter is done randomizing?
There’s no way to link outside of the effect unless you do a paid promotional effect (I think). Also, you can’t include links or QR codes in your effect because it’s against the Spark policies. They really don’t want you leaving the FB/IG app unless you are paying them for it.