I have used Snapfish in the past and it is a bit fiddly. If I remember rightly you upload them to one side of the page then drag them with the cursor to the other side to be included in the book (or whatever you require) If you are just sending for photos I can recommend the Asda service - I used for the first time last week I was amazed at the speed and quality of the printing. I had over 200 to be printed so the cost was 5p each. I ordered online and picked them up from a nearby store the next day. Will certainly use again.