Hi Phillipe, your local database won't be available in the sandbox environment. If you have a licensed node you should have to the possibility to upload a local database. Otherwise, you'll have to recreate your local data.
What some of us do is create a microflow to create the neccesary (dummy) data or configuration. That way, no matter where you deploy (or who), pressing a button would give you everything you need. Only drawback is that this takes some time initially.. I can recommend this!
Many thanks Sjors for your update. I’m discovering Mendix environment and I’m thankful to experts like you who take the time answering beginners like me. I’m more a business processes expert and am “dreaming” of a business apps world where clients customisations will be replaced more and more with such easy-to-code tools.
Thanks for the tip. I’ll investigate. Another way could be to upload an Excel file as well?
An option could be for a new project you could use https://docs.mendix.com/studio/start-with-data to generate a model from a spreadsheet, with the data.
But I just realised that it is possible to upload your development database to the teamserver: https://docs.mendix.com/howto/collaboration-requirements-management/sharing-the-development-database#7-commit-a-data-snapshot. This will give fellow developers the possibility to use your data. Usually Mendix will use the snapshot if available the first time you deploy your app locally. When Mendix creates the database tables it will detect the snapshot and use it. I'm not sure if this works for sandboxes as wel, but worth the try.