# Preview creative assets before uploading

This endpoint allows you to preview creative assets before they are permanently uploaded to the system. 
It validates the files and metadata, returning a preview of what will be created without actually 
storing the creatives. This is useful for verifying that your files and metadata are correct before 
committing to the upload.

Endpoint: POST /creative_draft
Version: xx.xx.xx
Security: Auth0

## Request fields (multipart/form-data):

  - `filename` (array, required)
    Creative asset files to upload

  - `metadata` (object, required)
    JSON string containing metadata for all files

  - `metadata.advertiser_id` (integer, required)
    Example: 123

  - `metadata.is_https` (boolean)

  - `metadata.submissions` (array, required)

  - `metadata.submissions.name` (string, required)
    Example: "one.jpg"

  - `metadata.submissions.click_through_url` (string, required)
    Example: "https://example.com/clickThrough"

  - `metadata.submissions.landing_page` (string)
    Example: "https://example.com/landing"

  - `metadata.submissions.concept_id` (integer, required)
    Example: 123

  - `metadata.submissions.backup` (string)
    Optional backup image filename for HTML5 creatives. Used as a fallback when HTML5 content cannot be displayed.
    Example: "backup_image.jpg"

## Response 200 fields (application/json):

  - `data` (object)

  - `data.uploaded_files` (array)

  - `data.uploaded_files.name` (string)

  - `data.metadata` (object)

  - `data.metadata.advertiser_id` (integer)

  - `data.metadata.is_https` (boolean)

  - `data.metadata.submissions` (array)

  - `data.metadata.submissions.landing_page` (string)

  - `data.metadata.submissions.click_through_url` (string)

  - `data.metadata.submissions.concept_id` (integer)

  - `data.metadata.submissions.backup` (string)

  - `meta` (object)

  - `meta.status` (string)

## Response 400 fields (application/json):

  - `data` (object,null)

  - `meta` (object)

  - `meta.status` (string)

  - `meta.error` (string)