Hello ATR. On my Mac Premiere Elements 11 in Expert mode, Transitions gives me a drop-down menu having these twelve categories, each of which has choices within it: 3D Motion, Dissolve, Iris, NewBlue 3D Explosions Elements, NewBlue Transformations Elements, NewBlue Blends Elements, NewBlue Motion Blends Elements, Page Peel, Picture Wipes, Slide, Wipe, and Audio Transitions.
The menu header instructs users to drag & drop one of these transitions between clips. When one drags one of these furnished transitions, a small dialog box appears, asking if the transition should be applied to the end of the preceding clip, between the clips, or at the beginning of the following clip. Also, I tried dragging one of the transitions directly onto a clip and there appears a small arrow in the header of the clip in the Timeline showing that there is a transition present. One can also drag one's own BMP file from a Finder window directly into the Timeline itself, and the file is instantly incorporated.
But I am still learning how to incorporate my own mask.
Many thanks for helping to sort out the information on the video transitions differences between Premiere Elements 13 Windows and Mac.
There are all sorts of possibilities for creating your own video transitions. Maybe we will go into that in the near future.
This was pleasant and educational for me. Perhaps some good will follow.