Hi, @Jaseismine As @LongHiker stated you can move the photos using my files. Here is a link with more information and the steps on how to do this. https://www.samsung.com/us/support/answer/ANS00062607/
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@Jaseismine If you want to move current photos from the internal memory to the SD card, you can use My Files or another file utility.
If you want future photos to be saved to the SD card, go into Camera settings and make the selection to save to SD card.