Hi Avila, can you please post the .3dm model file? It helps a lot to see what is going on if I'm able to examine the actual geometry instead of only screenshots.

But based on your screenshot I'd say this is going to probably be a difficult corner juncture here:



It would probably be good if this edge was not there:



Also something like this probably isn't good because the fillet won't be able to trim the base object if it just abruptly ends without running into other faces or other fillets that it can be trimmed against:



I can try to give you some better information if you can post the model file.

- Michael