Moving this discussion to the Adobe Send forum.
Are you attempting to convert a file from one format to another, or trying to send the file to someone? It's not clear from your posting.
What service are you attempting to use?
Recently I tried to view a file by using adobe programme, I was asked to download a file which is not
existing from my computer . After downloading the file ending with xlsx format, something come out is cannot be readable. Please advise how to fix this problem.