Alternate & mix

Interleave two PDFs (great for duplex scans).

First PDF (A)

Choose Aor drop here

Second PDF (B)

Choose Bor drop here

Mode

Interleave — A₁ B₁ A₂ B₂ A₃ B₃ …Reverse B — A₁ Bₙ A₂ Bₙ₋₁ … (for scans of even pages done in reverse)