iMovie Cross-Dissolve greyed out?
I'm working on a new Project in iMovie.
I have imported two 'timelines' into the Project editing area, one of a motion background, and one of myself speaking backed by green-screen. No problem selecting Green/Blue screen and combining them, working fine.
The 12-second motion background needed several copy/pastes to make it long enough to continue through the full speaking timeline, and I added cross-dissolves to make each loop less jumpy. Done, no problem.
The speaking timeline was also split into several sections for 're-dos,' and now I'm trying to add cross-dissolves in between those sections also...but Add Cross Dissolve is greyed out, not selectable. This even if I separate the two timelines back into Cutaway instead of combined into Green/Blue Screen.
Why? And how to enable cross dissolve on the upper timeline?