Hi Tereza,
I am not aware that Snowflake is able to handle different files. However for example, if you are looking to query, for example, JSON (https://docs.snowflake.com/en/sql-reference/functions/parse_json.html177), the JSON will need to fit within a cell of an actual storage table. If you have a JSON file for example, create a CSV out of it and upload it to KBC's table storage. Then you can set it into your input mapping of your Snowflake transformation/workspace.
Hope that makes sense?