Thanks for the explanation. I am fine with working within limitations- right now I am just feeling my way around MoI to see what I can and can't get away with.

Image 1- I created a curve and used it to Boolean Difference the top edge.

Image 2- I select these edges.

Image 3- Fillet works. It's a bit small but I'll take it.

Image 4- I select more edges and Fillet doesn't work.


Basically, if you were to remake this object in a way that is more compatible with the program's capabilities and limits, how would you do it? Feel free to make changes.