Kindle Fire HD OS 5 Memory Full Message

I’m hoping there are some clever people on CT who can help me solve the above issue.  A long winded question, but I have tried to cover all points.  I’m pretty green about the storage on this device, I understand a filing cabinet 

I keep getting a message to say that my internal memory 5GB is full or almost full.  I have faffed about for several days to try to reduce this by using a 32 GB SD card.  So far the success rate is very low.  I have requested that all Apps, Movies & TV shows, Music, Photos and personal videos, Audio books, Books and Periodicals are on SD card.  I have no music movies or TV shows or games.  My Apps are BBC radio IPlayer, BBC News, Facebook, Facebook and Messenger and all except BBC Radio IPlayer are SD compatible.  I have succeeded in downloading all my Audible Books to my SD card and some of my books (I understand that actual books use little memory as they are usually kept in your library and downloaded to read).  I have been unable to transfer photos and videos from the Kindle memory – only a few actual photos taken on the Kindle, mainly downloads from Messenger from my daughter of our granddaughters, similarly with videos.

My internal storage shows 563MB of 5.63 GB free breakdown as follows:-

Misc 2.04GB Apps & Games 1.85 GB, Personal Videos 656 MB 17 items, System 528 MB, Photos 29.92 MB 102 items, Amazon Movies & TV 1.25 MB for 1 item (?system?) Doc’s 371 5 items (Welcome to OS 5 92.07 KB twice, Introducing On Deck and other new tablet features 76.54 KB twice, one doc of mine 35.7KB)

VIEW CONTENT, brings up message ‘You do not have any content that qualifies for 1-Tap Archive. Please tap the back button and use the storage settings page to remove content from your device.’

ARCHIVE NOW says ‘not available for achieving.  Please delete contents individually’

I am so confused.  I do not want to lose photos and videos of our granddaughters, or the photos taken but could live with losing the latter.

This situation only appears to have arisen since an upgrade which includes an icon for Alexa – is this coincidental??