It is not possible to add galleries on some wikis using VE. Process:
- search for images (if needed) and select one
- the image is not added to the gallery list.
- Save: the gallery is not added
Same thing when you want to update a gallery.
Seems to be specific to some wikis. Tried on:
- en.wp: works
- meta: works
- fr.wp: doesn't work
- pl.wp: doesn't work
- it.wp: works
- ko.wp: doesn't work
- pt.wp: doesn't work
with Firefox, Chromium and Edge (last versions).