This is an interested question as I am posting in this monthly challenge, but for sure it will be somewhat useful for others users...

How do the thumbnail scraper choose the images that will show up in the Current Lite Challenge Thumbnails ?

In my #latest WIP#, i posted two images, one being the actual entry, the second being the transparent version for members' usage. Both are .png-24 and despite multiple edits, it is always the transparent version that show up in thumbnails (while i expected the other one).

Is it something we can fix ourselves in some way while editing (ie. something tricky, like managing attachments in a certain order), or does it need the spontaneous apparition of a moderator ?

Thanks in advance for your answers !