Open the My Files app. Go to Internal Storage, DCIM, Camera. Then just select the file or files you want to move, tap "move" on the bottom left and select where to move them to.
If you open up your gallery, find the photo/video you want to move then long-press it to bring up any options. Depending on your device, the interface may be different mind you. There you should find a 'move' option (if not, there should be a 'more' option, which should bring up a list of items. 'Move' will likely be among them).
After that, it's simply picking an album, or creating a new one.
