I can't create assets folder

Hello All!, It’s my second day with the product, I running on Ubuntu server 20.04. It appears everything is installed correctly and the Wappler system check returns no errors or missing modules. I’m trying to learn the basics but have a bit trouble with the videos and my version being different. I’m trying to setup the Assets folder but when I select folder it asking for a file? and no way to select a file. can anyone help me?
Thanks Dave