We have a created an import package. Source is from SFDC & target is Zoho One CRM. We are using Returning feature to get back Zoho ID in Salesforce. We have faced 2 different issues here:
1. After setting Returning checkbox, the package takes a lot of time for running. The packages stays in Queued state for more that 15 minutes.
2. The records gets imported at Zoho One CRM end but it didn't synced back the Zoho ID in Salesforce.
We do have the premium subsrcription of Skyvia.