Kogan KADVC12XXXAA User Manual page 71

You can choose [Delete Selections] to delete certain file.
Delete One
Delete All
Delete Selections
Note:
The files cannot be recovered once deleted. Therefore, please make sure you have
a backup file before delete. The protect files will not be able to delete. You must
unlock the file before deleting the protected file.
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Delete one file.
Delete all files.
Choose the file and delete.