In this article I will show you How to load file by fid in drupal 8 & 9 and get url or uri, also how to print this file in markup.
Method 1: get url use file_create_url() method
$file =File::load($fid);
$path = file_create_url($file->getFileUri());
Method 1: get url using url() method
$file =File::load($fid);
$path = $file->url();
return [
'#type' => 'markup',
'#markup' => "<img src='$path' width='100' height='100' />"
];
