Running Fusion 360 v2604.0.316 x86_64 on Windows.
When overwriting an existing file the user is asked twice whether they really want to overwrite.
Select Save as Mesh from component tree context menu
Select OK from Save As Mesh dialog
Check Save to my computer on Save As dialog
Select "..." button to browse for file destination
Select a pre-existing file
Browse dialog generates "File already exists, do you want to overwrite?" dialog
Select Yes/Overwrite
Returns to Save As dialog w/out writing yet
Press Save
A 2nd "File already exists, do you want to overwrite?" dialog appears
Select Yes/Overwrite
File is written as intended
The Windows SaveFileDialog API used to browse for the file destination includes an OverwritePrompt property that is being set to True, but should be False, since the enclosing Save As has that confirmation separately.
