I set up and used Smart Switch to move stuff from my wife's dying Galaxy S4 phone to my seldom used Galaxy Tab S2. It seemed to complete successfully. My embarrassed question: where did it put the stuff? Any guesses appreciated.
If you moved from phone to tablet. That could be a little interesting where stuff went. But for photos and videos. It should be in your photos and videos app. The rest of the things try looking in the download or documents folder. In your my files app