newbie with question on inverting fillets.

[gdcm1964]

**disclaimer** I am brand new to CAD software.

I've been following along with Lars Christensen's video's and making the electrical box he is in his  fusion360 for absolute beginners video series.

Everything was going great until I tried to add the fillets for the extruded parts for the screws for the cover.

I'm pretty sure my version of fusion is newer then what he is using in the video's as I don't see some of the things shown in his.

I'm running version  2.0.16985 x86_64

When he did the fillets at the 15/51 mark in the video his menu for the fillets is different then mine..that isn't a huge issue but what is causing me grief is..when I add the fillets they are convex and wrap around the extruded part for the screw instead of being concave like his are.

I searched here and found people asking the same question but some answers don't load and others are way above my skill set. 
Can someone point me in the right direction?

Lars's video 

[jhackney1972 · Accepted solution]

If you are getting an inverted Fillet, it is probably because you are trying to apply it between two independent bodies instead of one body.  The video will explain.

[gdcm1964]

Thank you John. Worked like a charm.

It threw me at first because after I combined the bodies the vertical line separating them was still visible but after I added the fillet they came out concave.