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Srivani GorthiSrivani Gorthi 

Unable to complete challenge for "Data Import" module. While trying to map unmapped fields, 'Map' button is not visible and unable to finish the challenge, Please help how to get map button

NagendraNagendra (Salesforce Developers) 
Hi Srivani,

Sorry for this issue you are encountering.

I have seen the exact same thing and just stopped using Firefox for Data Import. Chrome and Opera work just fine. (clearing the cache makes no difference)

These browsers support the Data Import Wizard:
  • Google Chrome™ version 29 and later
  • Mozilla® Firefox® version 23 and later
  • Microsoft® Internet Explorer® version 9 and later
  • Apple® Safari® version 5 and later
Hope this helps.

Kindly mark this as solved if the information was helpful.

Thanks,
Nagendra