can images hosted at google-drive, one-drive, etc can be embedded into the posts?
Try it 
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if yes, then in my view that would be the best way of going forward, no third party websites required.
Unless you own Google and Microsoft, those are third party websites.can't try as i don't use any cloud services.
and what i meant was the images u upload to ur own cloud account remain their.
unlike other third party services.