https://forums.autodesk.com/autodesk/attachments/autodesk/fusion-support-forum-en/68041/1/Whisper - Learning Fusion 360.f3d

Problem converting mesh into a workable file

https://forums.autodesk.com/autodesk/attachments/autodesk/fusion-support-forum-en/94940/1/Sq to round v4.f3d

learning from tutorial

https://forums.autodesk.com/autodesk/attachments/autodesk/fusion-support-forum-en/94941/1/Transition Sketch1.f3d

learning from tutorial

https://forums.autodesk.com/autodesk/attachments/autodesk/fusion-support-forum-en/94943/1/Rec to Round Transistion.f3d

learning from tutorial