Flatly does not offer demos. The service is designed to be intuitive and turnkey so usually a 10-15 minute self-guided tour is enough to get up and running.
Flatly's Knowledge Base is quite extensive and provides a number of helpful articles.
Lawnroller or higher plans offer some in-product support. See Pricing
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Use Upwork or an alternative freelancer platform to find experts who are familiar with Extract-Transform-Load workflows.