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If working with ProRes exported from an NLE, before performing a video insert on the file, you will need to re-wrap the file to ProRes Pad. To do this, simply drop the video file into the preview window on the right of the re-wrap an rewrap and audio versioning tab. Once the file is loaded, on left look for bit rate bitrate type. Make sure it is set to VBR pad and click process now. This will generate a new rewrapped file in the same directory that you should then be able to insert into.
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