Currently, EditorImageBrowserController of the Editor requires IHostingEnvironment which is outdated in Asp Core 3.1.  The IHostingEnvironment is replaced by IHostEnviornment. 

- https://docs.microsoft.com/en-us/dotnet/core/compatibility/aspnetcore#hosting-ihostingenvironment-and-iapplicationlifetime-types-marked-obsolete-and-replaced