# Questions and answers
A complete instructions set is not available, but below are a collection of questions and answers about the project and use of the app.
## Are you keeping the uploaded data?
No! All uploaded data is deleted when the session ends, so only stored for your analyses and the immediately deleted.
## How do I merge multiple datasets?
You can merge multiple sheets from ods or xls(x) files on import when a common key variable is present in selected sheets. Multiple file upload/merge is currently not supported.
