Consider purchasing a document scanner. Once you've had one for a while you'll wonder what you ever did without it.
We're not supposed to hawk products on Medium, but the Fujitsu ScanSnap series is popular with law offices and I'm not affiliated in any way with the company.
You should also have the "Receipt Bank" and "Scanner Pro" apps to help you quickly scan documents and receipts on the go.
Finally, "Magic" for business is like having your own office staff to help you keep organized. For example, they can call your clients to make appointments, schedule flights, remind you to pick up the kids from school, arrange for a babysitter from a list you provide, etc. This will free-up headspace for you to focus your creative energy on your business.