Until now, a Lectra document wasn't really one thing. The reading was a PDF in one place, your handwriting was somewhere else, your notes somewhere else again, and the parts that made it feel like yours, its title, the folder you filed it in, whether you'd starred it, weren't stored with the document at all. It worked, but it meant you couldn't hand a document to anyone, and you couldn't be certain you'd taken all of it with you when you backed it up.
Documents now save as .lectra. Everything that makes a document a document lives inside it: the reading or notebook it's built on, every mark you've made on the page, your notes, its title, and where it sits in your library. Your iPad shows it as one document. So do Files, iCloud Drive, and AirDrop. You can send one to a classmate and it arrives whole, filed where it belongs, with your annotations still on the right words.
The same format Lectra saves to is the one it shares, which is the part that matters most. There's no separate export that can quietly fall behind what the app actually stores. And because a .lectra carries its own title and filing, a library can be rebuilt from nothing but a folder of documents. Lose the app, reinstall it, drop the folder back in, and your library comes back the way you left it.
A few things we cared about getting right. Reopening a document you already have asks whether you want to restore over your copy or keep both, instead of guessing. Annotations are tied to the content itself rather than to a file name, so renaming things never leaves your marks stranded. And a document checks itself when it opens: if a reading arrived damaged, Lectra says so rather than opening a broken page and letting you find out later.
There's a deliberate seam inside every .lectra, between the material a document is built on and the layer you write on top of it. Right now that's just good hygiene: your work and the source are never the same thing, so neither can overwrite the other. It also happens to be the foundation for something we want to build, where an instructor hands out a package, updates it mid-semester, and your notes survive the update. That's not here yet. The format is ready for it.