# Create preview background file

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

Main resource to add a preview background file. It stores the preview background file and generates a rectangle thumbnail.


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


## Authentication methods
- Jwt authorization


## Parameters

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



## Responses
### 201
Preview background file added successfully

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

### 400
Wrong file format or error saving file


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