We use FileUltimate for file managers on the back-end of many corporate websites, and we've moved our standard offering over to .net core 3.1 for many reasons. Unfortunately FileUltimate is the one piece of the puzzle that we can't get working in our new apps.
We can use it in a .net core 3.1 app if the target server has the 2+ assemblies installed, but when deploying to a containerized service that targets a single version of the .net core sdk it fails to load the dependencies for GleamTech.
Is .net core 3.1 on the horizon? Previous versions of .net core seem to be getting left in the rearview mirror very quickly by MS and the community at large.