I can upload an image but if i select browse server i get nothing , also if i go to Media manager i get a blank screen > i do not see any errors ?
See image
Any suggestions > this is a clean install

Install using the URL installation, dont download, it will not work.

Hi there. My solution was:
so to
media/k2/assets/vendors/studio-42/elFinder
there is two folders.
elfinder and elfinder.1
I renamed elfinder to elfinder123 (likeexample) and elfinder.1 to elfinder.
Also check the jquery plugins on system and k2, k2 in my case turned off.

Question to devs, Can I change the media manager elfinder to standart joomla? I want to able put direct URL to image. If yes, how can I do this?
Thanks

Thanks for your reply. One question more, is there any way to insert the WebP format to item image? I've added permissions to upload files, but when I try to add the .webp Media manager says that wrong img format file. Is there some way to fix it?

Hello Fotis. Still the same.
The image was not uploaded. Please ensure that you used a valid image file and that file uploads are properly configured on your server.
Any idea? Thanks!

I have exactly the same problem.
This is not the fault of the hosting company, because I have a different installation and it works.
Interestingly, the new K2 installation does not work. Older after the update works ...
jQuery disabled. Joomla 3.9.2. K2 version - 2.9.1 installed from the following link.
I noticed one more error: deleting and re-uploading the avatar restores the old picture.
If I have something to check, I am asking for information. I will gladly help you, but for now I do not know what to look for.
Version with removing folder / media / k2 / assets / vendors / studio-42 / also did not help :(
I'm sorry, but English is not my native language;)

Sorry. I was wrong. After updating Media Manager K2 does not work on any site.

The solution is here:
www.joomlaworks.net/forum/k2-en/49675-k2-media-manager-not-showing-pictures?limitstart=0

Yes!
Thanks :D