Gah. Thumbnail yet??

I just got the Zoho Docs app yesterday, and actually have spent 3.5 hours trying to make the thumbnail image show.

I see discussions have been going on for years, and finally I saw the most recent date of a reply, in early October. But it says "We are working on this 'already' (in context it's not already) and my android app has a place to turn it on. So I figured it HAD to be possible.

If the feature is still coming, can you make it clear? I'm extremely grumpy having spent all that time searching every FAQ, how-to quide, tips & tricks on the planet and not solving my problem. Thanks!