At its simplest, I have two objects. The first is a modified block. Then I add a cylinder, shaped like I want. This is to be joined to one end of the block.
If I move the cylinder into the position that I want, it seems I am getting an automatic union of the two objects. If I select the block to begin the Boolean union sequence, I find that both objects are selected. I cannot separate the two objects to try again.
I have to be doing something wrong, but I’m stuck. Any suggestions?
Oh yes, sorry. I’m using Blender 2.81a.