Without knowing any details, one helpful thing would be to build an app that tracks the metadata about the Excel contents and put some versioning on the files i

Without knowing any details, one helpful thing would be to build an app that tracks the metadata about the Excel contents and put some versioning on the files in a cloud provider bucket. Make it easy for users to upload/download files. Also Sharepoint or whatever it’s called these days provides solutions for this type of thing. If you buy something then it’s just process changes and rollout and not 6 months or a year to build, test, etc.