Do not rely solely on auto-save (default: every 5 minutes). Before applying intensive effects like Track Mattes, Optical Flow, or AI Portrait, press . If the effect crashes Filmora, you lose 5 seconds of work, not 5 minutes.
The official Fixer Tool is Windows-only. Mac users can attempt recovery by: filmora fixer tool
The tool is not automatically installed with Filmora. You must download it manually from the official Wondershare support site. Here is the exact workflow: Do not rely solely on auto-save (default: every 5 minutes)