I cannot add galleries. When I click on ‘add new gallery’, the page to create a gallery is shown, however none of the controls work.
I cannot navigate to another tab. When I click on the ‘select images’ button, nothing happens. Etc.
The lightbox does work for images I added on pages.
I have deactivated two plugins that adapt the media gallery and also the Classic Editor plugin, but that does not make a difference.
In the Gutenberg editor, I can add a gallery block, but the ‘select gallery’ button does not do anything (perhaps because I haven’t been able to create any?).
I am running version 18.104.22.168 of your plugin and version 5.5.1 of WordPress.