My bad, had thought I had added in my dictionary example.
Here you go - https://pastebin.com/raw/wb9gw3L9

And my actual codes:
from datetime import datetime

def sortedPage(d):
    return {k: {'elements': sorted([v1 for k1 ,v1 in 
v['elements'].items()], key=lambda el: 
datetime.strptime(el['data']['created'], '%d/%m/%y %H:%M'))} for k,v in 
d.items()}

output = {k: sortedPage(v) if k == 'pages' else v for k,v in 
test_dict.items()}
pprint(output)

I am trying to retain the whole contents of the dictionary to begin with 
but with sorting options based on a particular key/value.
However I just noticed that in the code, I am missing the unique ids..

Example - The output of returned code:
{'page_order': ['rotatingTest', 'zoomingTest', 'panningTest'],
 'pages': {'panningTest': {'elements': [{'data': {'created': '04/10/18 
12:43',
                                                  'description': 'panning 
test for posZ',
                                                  'name': 
'posePan_positionZ_v001',
                                                  'project': 'TEST',
                                                  'version': '1'},
                                         'name': 'posePan_positionZ_v001',
                                         'thumbnail': 
'/user_data/posePan_positionZ_v001/posePan_positionZ_v001.thumb.jpg',
                                         'type': 'PosedWidget',
                                         'uid': '7lyuri8g8u5ctwsa'}]},

Whereas what I am trying to achieve:
{'page_order': ['rotatingTest', 'zoomingTest', 'panningTest'],
 'pages': {'panningTest': {'elements': {'7lyuri8g8u5ctwsa' : [{'data': 
{'created': '04/10/18 12:43',
                                                  'description': 'panning 
test for posZ',
                                                  'name': 
'posePan_positionZ_v001',
                                                  'project': 'TEST',
                                                  'version': '1'},
                                         'name': 'posePan_positionZ_v001',
                                         'thumbnail': 
'/user_data/posePan_positionZ_v001/posePan_positionZ_v001.thumb.jpg',
                                         'type': 'PosedWidget',
                                         'uid': '7lyuri8g8u5ctwsa'}]}}

Noticed that the '7lyuri8g8u5ctwsa' is missing as part of the key after 
"elements"

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