I tell you what this topic has evaded people for a while now prob over 5 years now..lol..What dont make sense is that Apple or anybody else can give a definitive answer as to what it is and how to get rid of it...wow
I have zero notes and voice notes, not that many iMessage. What I can remember, the size of "other" significantly increased when I was uploading files to Dropbox, but that app has been already removed.