Digital Frames Do All Digital Frames Have Memory To Store Pictures Or Do Some Of Them Just Read Them Off Memory Cards?

Do all digital frames have memory to store pictures or do some of them just read them off memory cards? - digital frames

I bought a picture as a gift, and I would be able to add photos to the structure from time to time for my parents. The one I bought, are not listed, which has its internal memory. Perhaps some of them with an internal memory, suggesting that it contains 2000 images better? So, either my sister or I could add images from our digital cameras?