If you use Xero Online to manage your client data, you can import these files directly into Analytics by logging into your Xero account and selecting the appropriate file. Xero imports currently only support up to one year of transaction data.
To import client data from Xero Online into Analytics:
Ensure that you have the Editor role or equivalent privileges. To connect to the Xero file, ensure that you have a valid Xero account and that you've been assigned the Standard user or Auditor role on the file. For more on users and roles in Xero Online, see their help materials.
In your Analytics engagement, select Add Data File | Import File From Xero.

A new browser window will open with the Xero login page. Enter your account credentials and select Login.

Select the appropriate client from the drop-down list, then select Allow access for 30 mins.

Select the checkboxes next to the client files you want to import, specify a Current fiscal year end date, then select Import.

Note: The Current fiscal year end date affects how the data is displayed, as well as the defaults for date-based Analytics tests. All data in the file, regardless of date, will be imported.
The client file from your Xero account is now available for use in Analytics, and is displayed in the Data Files pane.
If you use QuickBooks Online to manage your client data, you can import these files directly into Analytics by logging into your QuickBooks account and selecting the appropriate file.