Solved
Thunerbird suddenly won't allow me to attach documents
すべての返信 (2)
選ばれた解決策
https://support.mozilla.org/en-US/questions/1608942 Known issue the easiest work around till it gets fix is to drag and drop the file in the message
この投稿は Legacy により
thank you; that works. still like to know what _hanged after 'all these years' but ours in not to wonder why. thank you again. andy