using the micropublish.net micropub client to create this post.
now updating this post at micropubish.net by choosing its "edit all" function because its "edit" function returns an internal server error.
the update worked.
the problem with the "edit all" option is that the micropublish.net web page is loaded with a ton of form junk because edit all provides options to edit many things that are pointless to me. this is a problem with micropub. it does things that i don't need.
this post was NOT created in a subdirectory. i think that the update has a problem when the post was created in a subdirectory. will test next.