Insufficient Permission when writing to AWS Redshift

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I'm trying to write a table in AWS Redshift using the following code:

try:

(df_source.write

.format("redshift")

.option("dbtable", f"{redshift_schema}.{table_name}")

.option("tempdir", tempdir)

.option("url", url)

.option("user", user)

.option("password", password)

.option("forward_spark_s3_credentials", True)

.option("tempformat", "CSV GZIP")

.mode("overwrite")

.save())

except Exception as e:

raise Exception(f'ERRO: {str(e)}')

However I'm getting the following error:

"Exception: ERRO: An error occurred while calling o450.save. : org.apache.spark.SparkSecurityException: [INSUFFICIENT_PERMISSIONS] Insufficient privileges: User does not have permission SELECT on any file."

I've seen a solution to have an admin run a sql command like

GRANT SELECT ON ANY FILE TO `user1`

But it's not working and I don't think I'd like to give this grant to every user/group. So, why is this happening and how can I solve it in a more proper manner? I also have unity catalog enabled. Thank you!