Thanks in advance!
Hello Nicole, I think it will be useful if I define some things. In a salesforce sandbox using changesets you can only deploy apex code, triggers, and other settings in the sandbox to your production org OR another sandbox. If you deploy the new code to either production or another sandbox the users will not lose any data since you are just updating the code that generates the data.
So when deploying your changes from a sandbox you cant deploy "data/files". The sandbox has data and production has its own data. You simply just deploy the updated changes to the code/settings after you tested in the sandbox to production.
If you wanted to deploy data from a sandbox to production you'll have to use a tool call dataloader but it doesnt seem like thats what you want to achieve.
