Effects cannot extend footage. This has never been any different. You are mistaken. Only the native time-remapping can do this. The rest is unclear since your descriptions are rather vague and lack any genuine technical info. Otherwise AE doesn't discriminate - a layer is a layer is a layer and whether that's a DynamicLink element or a natively imported video doesn't matter.
Thanks for your answer Mylenium, I appreciate it, if you could help that would be amazing! I never used native time-remapping before so now I'm confused. So to be clearer, here is what I'm trying to do:
Drag a 10 second clip directly into AE, or dynamically link a 10 second clip that's already in Premiere to AE by right clicking on the clip in Premiere and selecting "replace with AE composition." Since I was filming the clip knowing I'd do for slow motion, it is 60fps and a high shutter speed.
I would like to slow this clip down to 50% in AE with time warp and not lose any of the clip. So, theoretically, a 10 second clip slowed down to 50% should come out to be 20 seconds.
Please help. Any help is appreciated.
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For anyone else with this question, there are 2 easy solutions that allow you to use TimeWarp on an entire clip, as the OP wants:
1) Enable Time Remapping on the layer, but don't touch the keyframes.
2) On the "Interpret Footage" menu, near the bottom is an option to loop the footage. Loop 2x for 50%, etc.
Either way, you'll need to extend the duration of the Comp Settings to fit the new length (i.e. double for 50%). You may also need to drag the end of the clip, but at least you'll be able to now.
(Tip of the hat to Mylenium)