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not sure if you can dissect something like this.

https://steemit.com/utopian-io/@dez1337/steemj-image-upload-has-been-released-upload-images-to-steemitimages-com-out-of-your-java-application

It has to be possible. Maybe check out the condenser codebase to see how it's done here when you drag and drop.

@smcaterpillar, Upvote for supporting you.