Webflow requires you to republish your Webflow site any time you make a change to the CMS (eg. add a new field to a collection) in order for syncing to work.
Publish to all domains
Webflow sites need to be published to all domains for syncing to work
Restoring from a backup
Webflow resets all item IDs if you restore your Webflow site from a backup. Since Whalesync uses those IDs to identify your records, restoring from a backup will break your Whalesyn configuration.
Published items
Only items in a "Published" state in Webflow will sync back to other apps.
Multi-reference fields
Whalesync supports multi-reference fields out of the box! See the guide below to ensure this is configured correctly: