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We need more info for trying to help. What OS are you using? What AE version? If you are using windows, are you using a third party plugin to create ProRes files? Could you upload a example clip of your rendered media to dropbox?
Sorry for the issue. Import the exported file back into AfterEffects & try preview.
I'm actually thinking my computer could be the problem, because I imported the file back to After Effects and it did show up in the preview.
I'm using Windows 10 and After Effects CC 2018. I'm not sure if I am using any third party plug ins to create ProRes files. I've been following this tutorial: http://helpwiki.evergreen.edu/wiki/index.php/Exporting_Video_from_After_Effects, except I'm not finding any video codec options under format options that say apple prores 422 (HQ.) Instead I've been using None (Uncompressed RGB 8-bit.) Are those the same thing?
I did also try uploading it to my dropbox account, and the video actually did show up. So maybe it's my computer and not the software...
Uncompressed RGB 8bit is not the same as ProRes 422. Probably your problem is that none of your OS video players can playback this kind of codec. After Effects and Premiere can read a lot of native video codecs but it is not the same for the media players on your PC.