Hey people it is possible to save the movements made when painting the canvas and then when the application starts, recover the movements in such a way that the drawing is recreated,
Yes, many people did it already. Save the coordinates x,y in a list.
When you want to recreate the drawing, iterate thru the list and draw lines from the previous item of the list, to the current one.
Before asking for the blocks, try something first. Then post here what you are having trouble with.
see also Scott’s solution here https://groups.google.com/d/msg/app-inventor-developers-library/yF2Auslt82M/e-9D1gSIS78J