from my understanding of your question and with the way I handle media files like images and videos... I go into my gallery... tap and hold on 1 photo/video... then a tick icon shows up... tick all the images and videos you want in a album...once you ticked them all you can press on the "3 vertical dots" top right corner and then press move to album to have them all organised in different albums.
if you've moved to a Samsung from another manufacturer and all your images are out of sequence or of a particular order then I'm not sure how to get them back into that particular order.