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You can only upload a new CSV file to overwrite all existing contacts.
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If you have a Zoom Phone license, you can also call your contacts using Zoom Phone. Contacts saved in your account will be saved in your account and synced with all of your Zoom desktop client and mobile app under Contacts tab > My Contacts section. Users can store personal contacts including names, email addresses, phone numbers, and more in Zoom by uploading a CSV file.
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