So, I have an arrowheads file which I've updated with an Arrow # 40 which disappears once I close the file like if the file was never touched. It is listed on the arrows list to be used, but not beside the others for editing. Also, that arrow is not listed when a different file is opened, only with the original one.
I've added my arrow as a symbol but the symbols window is empty when I open another file. There should be an option to add arrows as easy as swatches, to select the file and done.