Offline Media detected - but file is not missing
My work has recently upgraded to Premiere Pro CC (2020) and I'm having an issue I haven't come across before; I am trying to export out a video that has a MOV video file within it but it comes up saying the file is missing.

The file loaded fine into Pro and plays perfectly okay. Is it a case of Pro isn't liking the MOV file and I need to convert it before adding it to my project or is there something else I am missing? There was a warning message the first time I went to export it into the Media Encoder - something about the CODEC needed for it (begin with H) was part of a paid plan, but we have a paid licence so I am not sure what is wrong.
