Add half of the smoked salmon, zucchini strips, spinach, capers, and onion to the center of the tortilla, then roll up tightly.
Set seam side down in the air fryer basket. Repeat with the remaining tortilla
Spray oil or brush olive oil on top of the rolled tortillas and air fry to 400ºF, turning halfway through.
Serve warm and enjoy with tzatziki sauce.