Thank you for you response,
I tried what you told me but it still not happening, I still don’t get the transition to appear. This is what I am doing, (I am new at After Effects, just picked it up a month ago)
1. I make a new composition
2. I import 2 files (just stills fot now)
3. I drag file no. 1 to the timeline
4. I drag file no. 2 to the timeline
5. Then I go to the effects windows and choose transitions/Linear wipe and drag it to the top layer as you said
6. Then I shorten the top layer to about 10 seconds
7. I start second layer write after the 10 seconds clip
8. I preview to Ram but no transition showing up
Am I missing a step?, do I have to keyframe it? why is not as simple as drag and drop and that’s it?
Thank you for your patience