Give the SQL Server Service account permissions to write to that drive.
Reading up on the SQL Server Service Account.
https://blog.sqlauthority.com/2018/06/24/how-to-find-service-account-for-sql-server-and-sql-server-agent-interview-question-of-the-week-179/
Take a look at the above article to figure out the name of your SQL Server Service Account so you can give it the read/write/create permissions.
