Version History
If you modify a contract and save it as a new version, you can review both past and current versions.

You can track the modification and saving history of contracts.
Each version can be downloaded as a file, and the file name is saved in the format: "Contract Name_Version Information_Downloader"
You can select two versions to directly compare the changes. Learn more about Compare Versions
You can add comments for each contract version to record notes specific to that version.