Snowflake's hierarchical key model includes several levels of keys, where Account master keys and File keys are part of this hierarchy. Account master keys are used to encrypt all the data within an account, while File keys are used to encrypt individual files within the database2.

Reference: https://docs.snowflake.com/en/user-guide/intro-editions.html#data-sharing

To delete staged files from a Snowflake stage, you can specify the PURGE option in the COPY INTO
<table> command, which will automatically delete the files after they have been successfully loaded. Additionally, you can use the REMOVE command after the load completes to manually delete the files from the stage12.
References = DROP STAGE, REMOVE