Azure Document Translator for scanned and native pdf

Question

I am using azure document translator service for translating pdf.Some of my pdf's are scanned and some are native pdf. The below code I am using for translation.

#  import libraries
from azure.core.credentials import AzureKeyCredential
from azure.ai.translation.document import DocumentTranslationClient

# create variables for your resource key, custom endpoint, sourceUrl, targetUrl, and targetLanguage
key = '{your-api-key}'
endpoint = '{your-document-translation-endpoint}'
sourceUri = '<your-container-sourceUrl>'
targetUri = '<your-container-targetUrl>'
targetLanguage = '<target-language-code>'


# initialize a new instance of the DocumentTranslationClient object to interact with the asynchronous Document Translation feature
client = DocumentTranslationClient(endpoint, AzureKeyCredential(key))

# include source and target locations and target language code for the begin translation operation
poller = client.begin_translation(sourceUri, targetUri, targetLanguage)
result = poller.result()

print('Status: {}'.format(poller.status()))
print('Created on: {}'.format(poller.details.created_on))
print('Last updated on: {}'.format(poller.details.last_updated_on))
print(
    'Total number of translations on documents: {}'.format(
        poller.details.documents_total_count
    )
)

print('\nOf total documents...')
print('{} failed'.format(poller.details.documents_failed_count))
print('{} succeeded'.format(poller.details.documents_succeeded_count))

for document in result:
    print('Document ID: {}'.format(document.id))
    print('Document status: {}'.format(document.status))
    if document.status == 'Succeeded':
        print('Source document location: {}'.format(document.source_document_url))
        print(
            'Translated document location: {}'.format(document.translated_document_url)
        )
        print('Translated to language: {}\n'.format(document.translated_to))
    else:
        print(
            'Error Code: {}, Message: {}\n'.format(
                document.error.code, document.error.message
            )
        )

The above code is working fine when entire document is scanned or native but I noticed that some of my pdf are having few pages scanned and few pages are native. In this case the document translator is not translating the scanned pages from that pdf.How to translate this type of pdfs.