Field values will not update on import

[LosAlChoir]

The person who managed the lists/contacts before me uploaded the information with incorrect field mapping, e.g. Lastname, First Name is in the Last Name field and the First Name field is blank. To clean up the database, I"ve exported the contacts with all fields including custom ones and updated the information in Excel. My goal, in essence, is to override the data in all the fields with what is in the Excel spreadsheet for those fields. But when I re-import the corrected file, if there was already a value in a field, the new information was ignored. 

What are my options? There are too many records to manually correct each one.

Thank you for your help.

[William_A]

Hello @LosAlChoir ,

When you re-upload a contact, new information in already-filled contact fields will be used to overwrite the old info. Make sure when you're uploading the file that your contact field columns are appropriately assigned to make sure the overwrites are updating accordingly. If you continue to have issues, we'd recommend calling our general support so they can screenshare and troubleshoot the upload as it's happening live, or perform the upload themselves.