If you are adding a puzzle to an already created album, the program places the new puzzle between the puzzles where there is the cursor on releasing the mouse button.
On the top title bar of the opened album, there is the album name and the number of puzzles displayed.
You can minimize an album. The minimized icon displays the name of the album and the number of puzzles in it. You can also move a puzzle into the minimized album. Simply drag the puzzle with a mouse on the album icon.
There are many options what to do with an album. All of them can be found in the context menu of an album.