With active feed you may test the form submission to see if feed correct. We suggest you just map all mandatory fields and make sure it pass testing ( successfully insert record in to your Zoho ) and then map other fields.
When you enter values to form fields and submit form a record will be inserted into your Zoho.
The record which inserted from the above test:
How to debug your feed?
On the feeds list screen there's a checkbox named "Debug" for every feed. You just need check the checkbox and then
the plugin will save debug info when submit form.
After the checkbox checked, you may test your form submission again. And then refresh the feeds list page and you can download the latest debug log.
The debug log is a text file and readable you may adjust your feeds and form field value according to the debug log.