BenQ M32 User Manual page 56

5. You can choose the [Delete Selections] item 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 it.
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Delete one file.
Delete all files.
Select the file and delete.