I had our CRT ones uploaded to card ( yes I know it's included in price), and I didn't know to show at Donald's for scanning but pp person who helped me that afternoon said to show/have scanned at each meal. And if they are all sitting at same table wouldn't person bringging packages around question 2 packages at one table?
When I was at CRT (in May 2012), they wouldn't add it to our card and "begrudgingly" said they were able to "accommodate" us (not sure on what, since all 3 of us had individual reservation numbers and only asked to be seated together since the CM at the front said we would still each get our own individual print packages) NOTE: CRT already comes with the print package as part of the meal so the photopass + doesn't give you anything extra except adding the digital prints to the card. I asked if we got an extra print package (because, if so, I would have wanted one with all 3 of us). I was told NO extra print package (both in person and via disneyphotopass.com.).
For CRT and Akershus, we were able to get our digital prints added (for each of us, there were 3). You take the receipt from the print package to a Photopass station and the person there will add the prints to the card (not the photopass photographer taking the pictures)
Tusker House CM told us that they were the only ones able to add the digital prints to our card.
At every other character meal we ate (except Tusker House) - we ate at Hoop Dee Doo Revue & Akershus - we were told to bring the receipt for the character print package (that came free with the + card) to any Photopass Station to have the digital prints added.
For the poster who was wondering whether to get a photopass + card for each family, think of it this way, are you planning to do lots of character meals? Only Akershus & CRT includes the photo package as part of the price of the meal. Every other character meal charges $25-35 for the pictures. If you do plan to eat at the other 4-6 locations and buy the picture, then it is worth it to do the +. Same thing with ride photos.
And, I would make sure to have separate dining reservations for each family so each family gets their own print package. At Akershus, you can't be seated together. At CRT, you can (the CM at the front just notes in the reservation about whom you would like to be seated with).
At Akershus, sis was seated at a table for 4, I was seated at a table for 2, my BFF was seated at a table for 4. So, they wasted two tables because they weren't willing to seat us together (unless we combined our reservations and only got one print package). The good thing that came out of that was, instead of the family style desserts (where the table shares), we each got our own trio of desserts!