My sync failed halfway. How do I continue?

Before you start

• Logged in to Steam in this browser: Do I need to be logged into Steam, and how do I check?

Step by step

1. Read the red message on the “That sync did not finish” screen; it says what stopped the sync.
2. Look at the line “N of M events were saved before it stopped.” to see how far it got.
3. If the screen offers “Retry saving N events”, click it and keep the tab open until it finishes.
4. If there is no retry button, click “Back to sync options” and start the sync again.
5. Check “Recent syncs” on the Sync page: your failed run is listed in red, with the number saved as “+N”.

Good to know

• “Network error while uploading. Check your connection and retry.” means the connection or our server had trouble; the app has already retried twice, so check your connection and retry.
• “Sync upload is temporarily busy. Try again in N seconds.” means our server asked for a pause; wait that long, then retry.
• “Your session is still loading. Please try again in a moment.” also resolves by waiting a moment and trying again.
• “Please sign in to Steam in your browser, then try again.” means the extension could not read Steam as you; see the Steam login check. “Update the extension to use live or range sync.” means your extension is too old for that mode.
• “Retry saving N events” only appears when events were pulled but not yet saved. They are held in the open tab: closing the tab or clicking “Back to sync options” drops them, and the next run starts clean.
• Events are read and saved newest first, so after a failed full sync the older part of your history can be missing. “Catch up now” will say the history is up to date and does not repair this.
• To repair it, run a full sync again with “Rebuild everything instead”, or use “Fill first gap” in Coverage. A failed run is not counted as checked time, so Coverage shows the gap.
• “Recent syncs” lists each run with its time, mode and “+N” saved; failed runs are shown in red, and “Full log” shows up to 50 runs.