# Create preview file

**POST /pictures/preview-files/{instance_id}**

Main resource to add a preview. It stores the preview file and generates three picture files (thumbnails) matching preview when it's possible, a square thumbnail, a rectangle thumbnail and a midsize file.


## Servers
- http://api.example.com: http://api.example.com ()


## Authentication methods
- Jwt authorization


## Parameters

### Path parameters
- **instance_id** (string(uuid))
  Preview file unique identifier



## Responses
### 201
Preview file added successfully

#### Body: application/json (object)
- **id** (string(uuid))
  Preview file unique identifier
- **extension** (string)
  File extension
- **file_size** (integer)
  File size in bytes

### 400
Wrong file format or normalization failed


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