@G3SNA: The Tab S3 supports Micro SD cards up to 256GB capacity. If you are currently running low on internal storage space, then you may wish to install an SD card, which you can use to house your personal files and media (Photos, videos and music). To set the SD card as the default storage location for photos and videos captured on the Camera app, please open the Camera app > Tap the cog symbol > Storage location > SD card. To move existing media to the SD card, please head to My Files > Images (as an example) > Tap the 3 dots in the top right > Edit > Select the images you would like to move, or tap 'All' > Tap the 3 dots in the top right > Move > SD card > Move here.
