Solid roundup. You hit email, asking the other person, other devices, OEM clouds, recovery tools, Disk Drill, backups, Android restore, and pros.
Try Snapchat My Data export. Steps: Open Snapchat. Profile. Settings. My Data. Log in at accounts.snapchat.com. Request download. Wait for email. Download the ZIP. Open chats.html for saved messages.
I ran two tests in January 2026. Saved chats appeared. Turnaroud took 15 to 70 minutess. If nothing shows, repeat once. Keep Wi Fi on.