Second, use PHOTOSHOP software to process the pictures you want to express (the landlord who added flowers should be able to do it. As for the boundary, there are many forms of expression. You can use a brush or a mask. The simple point is to download the "border" brush directly, then load it into the tool-brush, then draw it in the picture with the brush, and then adjust the size and position with the move and deformation tools)
Third, merge the pictures and recommend the software Ulead GIF Animator 5, the fool animation software. Then create a box in it, then drag the picture in, set the time, import it into GIF, and it's OK.
Ps: You can directly drag your favorite GIF animation into the software Ulead GIF Animator 5, and then you can see the decomposed picture. You can refer to it