Sorry, would like to help/share experience, but get the error:
#1370964557: The session meta data cache must provide a backend implementing the IterableBackendInterface, but the given backend "TYPO3\Flow\Cache\Backend\PdoBackend" does not implement it.
after I copy & paste your Code from [quote=“christianm, post:1, topic:1313”]
TYPO3_TypoScript_Content:
[/quote]
to [quote=“christianm, post:1, topic:1313”]
dataSourceName: ‘sqlite:%FLOW_PATH_TEMPORARY%Cache/Data/TYPO3_Media_ImageSize.sqlite’
[/quote]
(42 Lines)
into: root/neos-base-distribution/Configuration/Caches.yaml and flush the cash.
Same in other installation without neos-base-distribution: root/Configuration/Caches.yaml. After deleting the content in Caches.yaml all is like before 
.
Maybe I misunderstood something in your advice!?