EXECUTE AS USER = 'DataImports';

SELECT  CURRENT_USER;

EXEC xp_cmdshell 'TYPE myFileNameHere.txt'

BULK INSERT DataImports.staging_AddressBook
FROM 'myFileNameHere.txt'
WITH (DATAFILETYPE = 'char'
,     FIRSTROW = 2
,     FIELDTERMINATOR = ' '
,     ROWTERMINATOR = 'n');

Msg 4834, Level 16, State 1, Line 20
You do not have permission to use the bulk load statement.