Support

 As a remote storage, Eventgallery currently supports Google, Flickr and Amazon S3). Totally clear, that you cannot support every other hoster, there are so many in the meanwhile. But I just wanted to ask if Amazon Prime Photos would be an alternative to think of, since it offers UNLIMITED storage for all kinds of photographs (including RAW formats). This is so useful, because there is no need of troubling with space anymore. And it's really cheap, compared to other hosters (with a lot of other handy things you get with a Prime account, but the image space is the killer, for me).
(And YES, there is the privacy debate with Amazon... but I don't want to open this box here and I also don't think that Google and co are much better regarding this.)

Ok, thats bad, without a public API...
I've just came around to that idea, because my Synology NAS has received the support of the "Amazon Cloud Drive" (and with that also the Prime Photos) in one of the last updates. So I thought maybe this would be possible here as well.

I've just googled around a bit: I'm not really familiar with these things, but wouldn't this be a starting point
=> "RESTful API": https://developer.amazon.com/public/apis/experience/cloud-drive/content/restful-api ?