App: Mpix Photo Prints
Developer: Miller's Professional Imaging
Genres: Photo & Video, Lifestyle

The Mpix Photo Prints extension allows you to easily use your Apple Photo collections to create and order premium quality photo goods including:  Prints, Framed Prints, Metal Prints, Canvas Prints, Wood Prints, Acrylic Prints, Greeting Cards and more.

-- To get started --

Open Apple Photos -> Choose Photos/Album -> Click Plus (+) Next to My Projects -> Select A Category -> Click on Mpix. 

Or Right-Click any Photo or Album in Apple Photos -> Select Create -> Select A Category -> Click on Mpix.  

If you don't see Mpix listed, please close and reopen Apple Photos.

-- About Mpix --
 
Mpix is a photo lab with a big heart for storytelling and creation. Your photos are printed on archival quality papers to create keepsakes that last for generations. If you can dream it, you can print it. Plus, nearly all orders are made and shipped within just one business day, so you receive your snapshots in record time.

Release notes:
Improved the uploading experience