TYPO3 Core

• Load pdf file in file module
• make new content element (e.g. text)
• link the headline to the new uploaded pdf file (= field header_link)
• save the content element
• reload file module
  the pdf file shows no entry in column "ref" - the reference index was not updated.
  So you can delete the file without error or warning.

This is the case in all fields which use the tca

renderType' => 'inputLink',
'softref' => 'typolink'

Problem: the editors are able to delete files which are linked in content elements.

Tested in TYPO3 8 LTS and 9 LTS.