I am no authority on this, but I remember that when St Mary MacKillop (Australia's first saint) was canonised recently, the lady who had received the second miracle required for canonisation (she had been cured of lung cancer) made her case public, whereas previously it had not been in the public domain. Eventually the woman who received the first miracle also went public. I guessed from this that that details of the investigation are not normally in the public domain.
Welcome to this forum, and good luck with posting in English as your second language. Your first two posts are perfectly good English!