---
title: "Understand preview datasets and variables"
description: "Use merge variables and preview datasets to test dynamic content."
canonical: "https://memo.ly/docs/understand-preview-datasets-and-variables"
updated: "2026-07-31"
---

# Understand preview datasets and variables

Use merge variables and preview datasets to test dynamic content.

**Who this is for:** Editors using dynamic content.

Memo supports a fixed catalog of merge variables and workspace-level **preview datasets** so you can see how dynamic content renders before you ship.

- Use merge variables from the supported catalog in your design.
- Manage preview datasets in your workspace to supply realistic sample values.
- Preflight flags unresolved variables so nothing ships with a raw placeholder.

## Expected result

You can preview dynamic content with realistic sample data.

## Common mistakes & troubleshooting

- For a stuck variable, see [How do I resolve an unresolved variable?](https://memo.ly/help/how-do-i-resolve-an-unresolved-variable.md).

## Related
- [Resolve preflight findings](https://memo.ly/docs/resolve-preflight-findings.md)
- [Glossary: Preview Dataset](https://memo.ly/glossary/preview-dataset.md)

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