


From:
outputs('Get_files_(properties_only)')?['body/value']
Filter:
item()?['{IsFolder}']
is equal to false.

Apply to each:
body('Filter_array')
Condition:
items('Apply_to_each')?['Created']
is less than or equal to
subtractFromTime(utcNow(), 14, 'Day')
Delete step:

File identifier:
items('Apply_to_each')?['{Identifier}']
This ought to get you started. If it helped, please mark it as a Solution.
Anne