Try to export to JSON, then import into 3.2. After that, use only 3.2 to animate. If that doesn't work, you can try running the rollback tool on your JSON before importing into 3.2, as explained here:
Spine editor and runtime version management
No guarantee that will work though. If it doesn't, you can try manually editing the JSON to get it to import into 3.2. For example, you may need to delete sections of data for features that don't exist at all in 3.2.
