The Lenovo U1 Tool is a "power user" utility. For the average user, it is often easier to email a file to themselves or use a cloud drive. But for Lenovo ecosystem loyalists, the U1 Tool (or its modern successor, Lenovo Freestyle) provides the fastest, most secure pipeline between your desk and your mobile device.
According to documentation from ASparkOfFire on GitHub , the tool is used as follows: lenovo u1 tool
With the rise of cloud storage (Google Drive, OneDrive) and general cross-platform apps like "Nearby Share" for Windows, the necessity for a proprietary tool like U1 has diminished. The Lenovo U1 Tool is a "power user" utility