https://api.drupal.org/api/drupal/core%21modules%21file%21tests%21src%21Functional%21MultipleFileUploadTest.php/8.9.x
MultipleFileUploadTest.php | Drupal API
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https://api.drupal.org/api/drupal/core%21modules%21file%21tests%21src%21Functional%21MultipleFileUploadTest.php/class/MultipleFileUploadTest/10
class MultipleFileUploadTest | Drupal API
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