Mix the cream cheese with the finely chopped fresh dill, the thinly sliced scallions/green onions, the chopped capers, the lemon zest, lemon juice, salt, and pepper. Give it a taste and, if needed, add more salt and pepper (to your preference).
Spread one-fourth of the herb cream cheese (about 2 oz) over each tortilla, stopping short of the edge by about half an inch. Add one-fourth of the spinach (about half a packed cup of baby spinach) and one-fourth of the smoked salmon (about 2 oz).
Roll the tortilla tightly and then wrap it in cling film/saran wrap. Repeat with the remaining 3 tortillas. And then refrigerate them all for at least one hour (but not more than about 4 hours).
Just before serving them, slice them. Start by slicing about an inch off the edge of the rolled tortilla on both sides. These will be your chef’s treat. Then slice the tortilla wrap into 6 pieces (each about 1 inch wide). Repeat with the remaining 3 tortilla wraps and you’ll get a total of 24 (1-inch thick) pieces.