Getting started

Just loaded the plugin and eager to get started

1. Went into <Add Gallery/Images>
2. Created a new gallery
3. Went to <images> –
Chose “files to upload” – click this button – does nothing
“Or you can drop the files into this window.” – no window shown

So tried upload images (same screen)- click – does nothing

I think I must be missing something pretty basic here?

https://ww.wp.xz.cn/plugins/nextcellent-gallery-nextgen-legacy/