Undefined array key "description_field_required" in \Drupal\file\Plugin\Field\FieldWidget\FileWidget::formElement

The warning can be prevented with the change in https://git.drupalcode.org/project/drupal/-/merge_requests/4574, but I don't know if there are any other effects of this field not being set.

I suspect that the proper fix may be in update hooks somewhere.

Thank you for reporting

So typically with these kind of issues we need to determine why this key isn't set. Could be masking a large problem.

Hi all,

Attaching a patch for D10 as well, in case anyone also needs it. Should apply cleanly using composer.