I made another attempt to remember the drawing process, this time I think I understood why the program stopped recording "randomly", but unfortunately I lost some of the shading at the beginning of the drawing, but at least I know what to pay attention to now so that I don't happen again in the future (hopefully).
https://drive.google.com/file/d/1fVkNwWr9FdYkIm16SI-j4Hjvm1KMG0JS/view?usp=sharing