The term “preview file” generally refers to one of two things: a temporary cache file generated by software to help your computer render complex data smoothly, or a lightweight snapshot used to view content without opening its source application.
The exact definition depends entirely on the context of the workflow. Video Editing (e.g., Adobe Premiere Pro)
In video production, preview files are temporary media files generated when a timeline is rendered. Preview files Explained in Adobe Premiere Pro
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