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# File Upload and Large Excel Download

This guide explains file upload and large Excel download. File upload uses REST API and `FormData`, with WAS/NAS, FTP, AWS S3, and Azure Blob Storage options. Large downloads use MyBatis Cursor, `@ExcelDownLoad`, and `ExcelUtil.createCursorExcel`.

On the client, use `restApi.uploadPost` and upload components such as `Upload` and `UploadBox`. Configure storage through `application.yml` and register `Uploader` beans with `@Qualifier("uploader")` or `@Qualifier("videoUploader")`.

For large Excel downloads, define a MyBatis `Cursor`, call `ExcelUtil.createCursorExcel`, and use `downloadStaticFile` from `download-utils.ts`. Preserve all source code, configuration keys, URLs, file names, error codes, and class names.