Can you upload several digital photos into the picture frame?

First, If you have the original film (negatives or slides), the conversion should ideally be done from those rather than from prints. There are two options there, doing it yourself or having it done. This subject has been discussed before on this web site, and I would refer you back to finding those. When a large number of photos are involved, there is no way to do this that is cheap, fast and low-risk (the "risk" here is sending your photot to a service that sends them to some 3rd world country for processing and they are never seen or heard from again .... it happens). If you do it yourself, you will spend hundreds to possibly over a thousand dollars on equipment that can do it well, and probably hundreds of hours doing the scans. If you have it done you will spend anywere from 15-cents to $1.49 per image, the media will be out of your posession for weeks (sometimes months),