> For the complete documentation index, see [llms.txt](https://docs.eseye.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.eseye.com/api-reference/bulk-operations-api/files/upload-or-download-file.md).

# Upload or Download File

Returns the AWS credentials you need to upload a file to S3, or a URL that downloads a file from S3. The `action` query parameter controls which one you get.

Set `action` to `upload` to generate presigned values for the file upload. The response includes `key`, `AWSAccessKeyId`, `x-amz-security-token`, `policy`, and `signature`. After this call, open **Upload File to S3**, go to **Body > form-data**, and choose the CSV file that matches your operation.

Set `action` to `download` to generate a URL that downloads the requested file. Pass the `responseFileId` returned by **Get ResponseFile** as the `fileId`. If the response includes a `url` or `fileUrl`, pass it to **Download via Pre-signed URL**.

```json
{"openapi":"3.1.0","info":{"title":"Bulk Operations API","version":"2.0.0"},"tags":[{"name":"Files"}],"servers":[{"url":"https://{fileUrl}","variables":{"fileUrl":{"default":"files.api.example.com","description":"Base URL of the File service (provided by Eseye)."}}}],"security":[{"bearerAuth":[]}],"components":{"securitySchemes":{"bearerAuth":{"type":"apiKey","in":"header","name":"Authorization","description":"Send `Bearer {token}`, where `{token}` is the `access_token` returned by Request a token."}}},"paths":{"/api/v2/file/{fileId}":{"get":{"summary":"Upload or Download File","operationId":"upload-download-file","tags":["Files"],"description":"Returns the AWS credentials you need to upload a file to S3, or a URL that downloads a file from S3. The `action` query parameter controls which one you get.\n\nSet `action` to `upload` to generate presigned values for the file upload. The response includes `key`,\n`AWSAccessKeyId`, `x-amz-security-token`, `policy`, and `signature`. After this call, open **Upload\nFile to S3**, go to **Body > form-data**, and choose the CSV file that matches your operation.\n\nSet `action` to `download` to generate a URL that downloads the requested file. Pass the\n`responseFileId` returned by **Get ResponseFile** as the `fileId`. If the response includes a `url` or\n`fileUrl`, pass it to **Download via Pre-signed URL**.\n","parameters":[{"name":"fileId","in":"path","required":true,"description":"The ID of the file. For an upload, enter the `fileId` returned by Create File. For a download, enter the `responseFileId` returned by Get ResponseFile.","schema":{"type":"string"}},{"name":"action","in":"query","required":true,"description":"Whether you are uploading a file or downloading one.","schema":{"type":"string","enum":["upload","download"]}}],"responses":{"200":{"description":"For `action=upload`, returns the presigned values for the S3 upload. For `action=download`, returns a presigned download URL."}}}}}}
```


---

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