Should work with 6.x as well. In the path picker, you can provide the path to a PDF file. You can also specify external paths to PDF files. Did you try this out in 6.x? Let us know if you encounter problems.

Sorry. Here is the thread: http://help-forums.adobe.com/content/adobeforums/en/experience-manager-forum/adobe-experience-manager.topic.html/forum__5fkv-hi_we_have_aaem6.html

Here's a related thread on upgrade vs fresh install. Although it is specific to 6.1, it may be relevant here.

I think amitgupt answered your followup question.

Here is the latest version of the document for AEM Assets 6.2 https://docs.adobe.com/docs/en/aem/6-2/develop/components/components-touch-optimized.html#Handling%20Field%20Events

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