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If you need to insert the SD card, you may need to remove the back from your Android. In some cases, you'll need to remove the battery from your Android as well before you can access the SD slot. Remember to turn off your device at first! Find the "Samsung" folder in your Samsung Galaxy's App Drawer, tap it, and then tap the My Files app icon, which resembles a white folder outline on an orange background. The My Files app is a stock app on most Samsung Galaxy phones running Android Nougat (7.0) and above. It's under the "CATEGORIES" heading in the middle of the page. Doing so opens a list of photo albums on your Samsung Galaxy. Tap the album from which you want to move your photos. If you want to select all of your Samsung Galaxy's photos, tap Camera here. Tap and hold one photo to select it, then tap any other photos that you want to move. You should see a checkmark appear to the left of each selected photo. You can also tap ⋮ in the upper-right corner, tap Edit, and then tap each photo that you want to move. It's in the top-right corner of the screen. A drop-down menu will appear. This option is in the drop-down menu. Doing so opens the storage menu. If you'd rather copy the photos onto the SD card (which will leave a copy of the photos on your Samsung Galaxy's hard drive), tap Copy here. It's below the "PHONE" heading near the top of the storage menu. Typically, you'll tap DCIM and then tap Camera to select the default photo storage folder, but you can select any folder on your SD card. You can also tap Create folder to make your own folder. It's in the upper-right corner of the menu. Doing so will move your photos into your selected folder on the SD card, thus removing them from your Samsung Galaxy's internal storage in the process. If you selected Copy instead of Move, this will store a copy of the photos on the SD card while leaving the original photos on your Samsung Galaxy's hard drive.
Make sure your Android's SD card is in place. Open the My Files app. Tap Images. Select an album. Select photos to move. Tap ⋮. Tap Move. Tap SD card. Select a folder in the SD card. Tap DONE.