A named stage holds files or points to files in cloud storage. You load those files into a table with COPY INTO. The stage name begins with @; a slash after the name narrows the load to a path. The file format tells Snowflake how to read each record. A CSV header is a row unless you set SKIP_HEADER=1.
Your local account contains original CSV and newline JSON fixtures in RAW.IMPORT_STAGE. The good/ path has two CSV files. The bad/ path contains a file with one invalid numeric amount. The json/ path contains three event documents. Use LIST to inspect filenames before loading. These fixtures live inside the simulator; creating another stage makes an empty stage. Cloud integrations and file uploads remain concepts here.