Hello, when in After Effects, you should be able to make your linked composition longer. Open the composition in the timeline, and using ctrl-k (cmd-k on mac) shortcut, you should have the Composition properties dialogue. In the duration parameter change the duration to something longer, and click ok. If your original clip was longer, you should be able to extend it. Now, go back to Premiere, and you should be able to do your dissolve. Hope this helps, Seb
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