# Upload asset direct

`POST` `/api/v1/assets`

Upload a CSV or Excel (xlsx/xls) file as multipart/form-data. Returns an
asset:// URI. For Excel files, pass ``sheet_index`` (0-indexed, default 0)
to select which sheet to convert to CSV.

## Request body

`multipart/form-data`

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| file | string | yes | CSV or Excel file to upload |
| sheet_index | integer | no | Sheet index (0-based) to convert for Excel files |

## Response

`201 Created` — `application/json`

| Field | Type | Description |
|-------|------|-------------|
| asset_id | string | An asset:// URI referencing the uploaded file |

## Errors

| Status | Description |
|--------|-------------|
| 400 | Bad Request |
| 422 | Unprocessable Entity |