Default mode for new directories. See self::chmod(). File core/lib/Drupal/Core/File/FileSystem.php, line

public FileInterface::getFileUri() Returns

public FileInterface::getSize() Returns

file_validate_is_image(FileInterface $file) Checks that the file is recognized as a valid image.

Defines an interface for file entity storage classes. Hierarchy interface \Drupal\Core\Entity\

file_validate_extensions(FileInterface $file, $extensions) Checks that the filename ends with an allowed extension

public FileSystemInterface::tempnam($directory, $prefix)

public FileSystem::moveUploadedFile($filename, $uri)

Default theme implementation to display help text for file fields. Available variables: descriptions:

public FileUsageBase::add(FileInterface $file, $module, $type