What each file carries
The Data file comes back with your own columns, rows and notes, with the preferred column set to your current stars. Framework carries the definitions, the order and any theme colours. Connections carries each link with its note, type and arrow. Settings carries your title, name, subtitle and version.
The layout file
When you have placed bubbles with Custom placement, reordered the hierarchy or file tree, or built a figure in Build mode, a small layout file is saved too. It holds names and positions only, never quotes. Since 13 October 2026 it is the only way to keep an arrangement between sessions.
If you close the tab without saving
Changes since your last save are gone, because nothing is kept in the browser. Save at natural breaks, as you would with any document.