// On gimp 2.10
1. Select File Menu > Open as Layers > Select all images you want to be in
the GIF > Open
2. In layers tab order your images > The GIF sequence will start with your
bottom layer and run through each layer bottom to top.
3. Select Filters from main menu > Animation > Click Optimize for GIF
4. To view GIF > Filter > Animation > Playback
5. To save GIF > Select File > click Export as
6. Name your GIF and choose folder > Select File Type > Click GIF Image
7. Select ‘As Animation’ > Select ‘Loop Forever’.
To change speed between each image change the delay
8. Click Export