Media not saving on assets

I erased previuos media from assent.
I upload the new media, media its saved.

But when I try to insert it into the asset. I can see the thumbnails being inserted. But when I clic save to save the media on the asset.
Media wont get saved.

I am running JOOMLA, with JA HOTEL.

Looks like, that the plugin plg_extension_solidres doesn't get installed by default.

So I went an download it the full package, unzip it.

Looked for the plg_extension_solidres.zip

Installed the plugin at Joomla, and pictures are showing now