I have a suggestion to the AppInventor's development team.
Whenever the blocks are downloaded as an image, they are saved in the downloads section as - blocks (blocks ++)
Instead of that if there could be two improvements on it -
Allow the user to choose the directory and give the blocks a name
Save the blocks in the downloads with the name -
projectName\screenNameor something more similar for easy identification.
I quite often use this feature to see my blocks rather than moving around the app inventor workspace, and when I like to see the blocks again, I end up downloading them once again as it is difficult to find the blocks I am looking for. (Though I now rename them and shift to another folder).
It will be highly appreciable if this feature is implemented!