If I use the custom Email option in the form's properties > Advanced tab > More Options, the header information (like IP address, browser, etc.) isn't displayed. Is there a way I can add it?

You can add header information using the code noted below for each field you want to include:

Date Submitted:

Record ID:
{BF_RECORD_ID:label}: {BF_RECORD_ID:value}

Form ID:
{BF_FORM_ID:label}: {BF_FORM_ID:value}

Form Name:
{BF_FORMNAME:label}: {BF_FORMNAME:value}

Form title:
{BF_TITLE:label} : {BF_TITLE:value}

IP Address:
{BF_IP:label}: {BF_IP:value}

{BF_PROVIDER:label}: {BF_PROVIDER:value}

{BF_BROWSER:label}: {BF_BROWSER:value}

Operating System:
{BF_OPSYS:label}: {BF_OPSYS:value}

User ID: (only works if user is logged in when form submitted)

Submitter Username: (only works if user is logged in when form submitted)

Submitter Full Name: (only works if user is logged in when form submitted)

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