Amazon Aurora RDS unable to use import file . Access denied for user in Mysql Workbench

I have created an amazon aurora rds database instance and successfully connected with Mysql Workbench with master user.Queries are also working fine, But i do not have all the privileges necessary to perform file import operations. I have read many documentations and threads related to this but am not able to GRANT privileges to Master user. Step by step guidance will be highly appreciated. Thank You.

via Chebli Mohamed