All files are lost after migrate from Google Drive to Zoho Workplace

All files are lost after migrate from Google Drive to Zoho Workplace

After click Migrate button, I received an email says: "Your migration from Zoho Docs to Zoho WorkDrive is complete". But there is no files in Zoho Workdrive. I mean completely empty. It says:

There are no items

Drag and drop or click here to upload.

Anyone has similar issue?