What you see
The Save button says where things stand: Save while there are changes not saved yet, Saving… while a write is in flight, and Saved when your account has it. Signed out, Saved means this browser has it.
If a save failed, the editor puts up a message that says which of the following it was. The exact words, and what to do for each, are in other error messages.
The connection dropped
"Not saved: we could not reach Mokxi" means the save never got an answer. Your work is still on screen. An autosave that fails is sent again by itself, up to three times over about a minute, and the message only shows if all three fail. The header says it is not saved meanwhile. Check your connection and press Try again.
It is too big
One save holds 1.5 MB. A project past that is refused, and the message names its biggest pieces, usually a huge pasted file or library. Make them smaller or remove them, then save again.
It changed somewhere else
"This project changed elsewhere" means it was saved in another tab or on another computer since this one opened it. Keep mine saves your version over it, and the other stays in History. Open the other opens it, and your version is kept in this browser.
You asked for Private or Link on Free
Free saves 10 projects, and they are public. Private and link-only projects come with Pro, so choosing one on Free keeps the project as it was and opens a card: Pro, one press to Checkout, or Keep it public, which is free. Projects you already made private or link-only stay that way. Students in a class and children under 13 are always private, on any plan.
Your plan is full
Free saves 10 projects; Pro and up have no limit. The projects lessons make for you never count. At the limit, a new project or a copy is kept in this browser and a card opens: Pro (unlimited projects, every tool), a 7-day trial of Pro with no card, or Free up room, which lists your projects oldest first to delete one. Once there is room, the save goes through on its own.
Every project you already have keeps saving, even if you have more than the limit: nothing is deleted, hidden or made read-only.
Your session expired
The account refused the write. That is not something you can do anything about, so the work goes to this browser instead and the editor says where it went. Sign in again and press Save; the document is still open in front of you.
A new project is only created when you press Save
Autosave to the account only ever writes a project the account already has. A brand new document is created on the account when you press Save, never behind your back. If you were expecting a project to appear in your account list and it did not, press Save once.
Signed out, Save writes to this browser's shelf of projects, and the Save menu's Save to my account is the one press that moves it up.
Private browsing, or blocked site data
Everything signed out is kept in the browser's own storage. In a private window, or with site data blocked or cleared, that storage can be empty or refuse to be written, and the editor carries on rather than failing. Nothing is lost while the tab is open, but closing it will lose it.
If that is your situation, sign in, or use Share to get a link that carries the whole project inside it.
You are watching someone else's project
Pressing Save there forks it into a project of your own instead of refusing. The fork is named by the server. See sharing a project.
How many versions are kept
Two hundred per project on every plan. Autosaves that land within a minute of each other share one version, up to ten minutes of editing, and every Save and restore keeps one of its own, so a long editing session does not push out a version you wanted from yesterday unless you made two hundred of those since. The free plan opens the newest five; the rest are kept with a padlock on them, and Pro opens them all.
Still stuck
How saving works is in saving and autosave. If a project is missing and none of this fits, write to us from /support with the project's name and roughly when you last saw it.