> I wondered if there had been some flag for the config file whereby the original file for attachment was
> processed by ImageMagick, but not stored, only the .png file(s) stored - or rather, some other way that achieved
> the same end. as there is no such flag at present.
> 
> For now, anyway, I can attach the documents/pics I want, then go in and delete the 'originals' as saved in the
> logbook, leaving just the .png files. But maybe something for the wishlist?

At least I now understood your problem :-)

You can have a script in your hidden logbook, that processes your attachments with "execute new", create thumbnails
of them (using ImageMagicks "convert") and submit those thumbnails as one additional entry to your public logbook.

But then you would get thumbnails of all attachments of the hidden logbook in the public one, maybe you don't want
that either? If you want them all, this method is more automated. If you just want some, do it as you suggested it.

In my opinion this is a rather exotic feature request :-)
I wonder if there is a second person in the world who could use it?