First make sure you have more then one layer in the PSD. If you do have more then one layer in the PSD then I’ve found restating Motion fixes it. If you don’t want to go that route you can alway right click on the Project Pane or Timeline and choose Import. Or go up to File, Import. Or you can use the short cut keys. Anyways…once you pick your psd you will get an option to choose the layer or All Layers. Then click on OK. Hope this helps and best of luck.
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