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Tell us which browser and device you use, what you did, and what happened. If a particular plan is affected, you can attach its .fp3d file (Export → .fp3d project file). We can only see a plan if you send it to us; projects are not stored on our servers.

If you lost a project, check that you are using the browser and device where you made it: projects live only there. If the site's data was cleared, the project can only come back from a .fp3d file or a share link you saved.