Do I have to use the Liene app?

You don't have to use the app to print your photos, but you can customize your photos on the app. You can apply its filters or effects to your photos, or choose to print regular photos, Polaroid-style photos, or ID photos. In addition to printing through the app, you can also directly print photos from your local album. See the user manual for more instructions on printing photos from mobile devices, PCs, and laptops.