Is it possible to have PDF and PNG versions of 'same' folio

Question

Is it possible when copying over the articles to have one folio as PDF and another as PNG?
Tried doing this by setting up an alternative folio as PNG and copying across the articles that were created for the original PDF folio, but they still appear to be PDF when loaded into the new folio and previewed on tablet, even though it has been set to PNG.
Do they only get converted to PNG when published? shouldn't one be seeing thumbnails in the DPS Folio Producer: Editor browser window. Trying to preserve the meta data tags between folios, or do I have to re-export these files and re-input the tags and attributes manually.
I see there is a way of copying articles between folios at an admin level, would this result in a correct transposition of PDF to PNG?

Answer 1

We use the K4 publishing system, and haven't started using their plugin yet, as we are still 'kicking the tires'. That said PDF and Android don't play together so well, hence looking at a PNG version without having to re-enter all the metadata again, which is what happens with the method you describe above.
The trouble is that the meta data is not part of the Indesign document so we have to re-enter it all plus there is the open/checkout/checkin/close of all documents from K4 which is a royal PIA, so uploading the same indesign documents isn't really helping. If the sidecar file worked 'properly' then perhaps that might be a solution, hear its not quite there though?
So, copying the article across to a new folio looked like it might work but not sure why when it asks when setting up the folio, whether you want PDF or PNG specs those do not stay set or why they are ignored on copying to the new supposed PNG rendition.
Would the K4 plugin solve this? would it work for all formats if we are building an Ipad and iPhone and Android version of a folio from the same document sourced in K4.