Step number 1- Right click on the folder/file you want to move.
Step number 2- Click "Cut" or "Copy"
Step number 3- Go to the already-created folder you want to move the file in.
Step number 4- Right click and hit "Paste"
Please note that depending on the size of the file you want to move, sometimes it takes longer/shorter for the file to appear in the new location. However, I have tried this myself many times, and all works well.
Let me know if this helped.