Force picture thumbnail generation

Hi.

I read several articles about this subject, but none was really THE solution.

When I browse the first time through a folder containing pictures, thumbnails are generated. So far … nothing new. To avoid thumbnail generation at folder showup time, I would like to have thumbnails generated either manually, or via cron (which checks for non-thumbnailed pictures and generates these).

How can I force manual thumbnail generation without accessing every folder manually.

Thanks,

Not possible yet → Migrate preview generation to async job execution · Issue #11685 · owncloud/core · GitHub

Too bad … many thanks !!!