Can not upload folder
It's not easy to say that the issue is related with the application or the phone, but it's obvious that Degoo servers are challenging with upload problems and receiving files which make many users to think it's a prank; also you should know that Degoo is a fully beta backup service with many bugs in coding, even without a web file manager. 
I would stop using it as a serious backup cloud storage for my important files, instead there are many tested storage services like Google Drive to be used; it's a fact that quality is not cheap or a speedy object.
If Degoo solves issues faster and prove itself as a huge cloud storage (not 100GB but more than 1TB for free) during next years it can be a successful innovation, but time matters.