Chats disappearing and conversations getting scrambled after new Copilot update

For the conversations that are still visible, you can preserve them without taking hundreds of screenshots. Open each important chat in Microsoft Edge, expand any collapsed sections, press Ctrl+P, and choose Microsoft Print to PDF. Save one PDF per conversation with the chat title and date. For content you still edit, paste the text into Word or OneNote and keep a second local copy.

Do not clear browser data, delete chats, or rename the affected conversations while Microsoft investigates. Make a short inventory of missing titles and note whether each was pinned, approximately when it was created, and the last time you saw the complete version. Verify that web and mobile are signed in with the exact same account address.

Then report the loss from Copilot's feedback menu and include that inventory, device/app versions, and UTC times when additional messages disappeared. The cross-device behavior points to account-side history rather than a phone cache, so preserving what remains and giving Microsoft identifiable chat details is more useful than repeatedly reinstalling the app.