i have been stuck on this one for a while and cant get past the miter flange part.
it says to select the inside edge draw a small line from there and then do the miter flange which appears it should run all along the inside edge of the U shaped part.
but all i get is' not suitable for this miter flange or the top edge flips over to make a normal flange anlong the top edge .
there is a sketch plane created on all the edges ,but it refuses to make a miter flange.
this is the only tutorial so far i am stuck on.
any ideas what the problem is ?