Hi shayne,

re:
> Is it possible to save a current 3dm drawing with the current history to this point embedded
> in the saved file so if I reopen it the Undo is available ?

Sorry no it's not currently possible to do that. it is something that I want to do in the future but it will require some carefully planned work to do it because as you note the amount of data to save could become considerably large in size.

I've been thinking that it might be good to have that type of history saved in a companion file instead of directly in the .3dm file. Then it could be easier for that companion file to be a SQLite database file and then I wouldn't have to try and make my own high data size storage and query functionality.

- Michael