Radically easy to access on brand approved content for distribution and omnichannel performant delivery. AEM Assets Content Hub and Dynamic Media with OpenAPI capabilities is now GA.
Please explain extras in livecycle with an example. in terms of usage, form validations, best practices.Better if you can post a sample pdf along with it
There's this post as well, Adobe LiveCycle Designer Cookbooks by BR001: Custom Properties . Basically it is an area of a XFA form where you can put whatever content your system needs. I tend to use the <desc> element instead as this shows up on the Info tab in Designer, though if you are importing a schema with annotations these will also be loaded under the <desc> element so you may want to keep them separate. The <desc> and <extras> can be access the same way and there is an example in the blog above.