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The Files app works on both macs and cps in conjunction with your phone. What it does is stores and views documents and easily transfers files between your computer and phone.
You use your wi-fi connection or the finder to transfer the files. You get a dropbox address and then you can type into your browser this address and you can upload your documents and then access from phone or computer. If you are familiar with FTP, it is a similar concept.
Many file types can be viewed such as Word, Excel, Powerpoint, PDF and image files. You can send the files as attachments in emails too.
This is a secure and helpful program which can come in handy for files that are too large to email to or from your phone, but you want to be able to access from anywhere.