Are the automatic preview working?

Hello, I've uploaded 2 big PDF on my site this morning.

I can't see the cover preview.
I have JoomlaTools connect v1 and I've read moths ago that we have to update this to v2, but to update to v2 i have to update Joomla too and now is not the moment.

Are the preview function workin yet with Connect v1?
If yes, maybe is only in queue and generating on your server.
If yes... when you stop supporting v1 of Connect?

Thanks
Erik