PP 2017 has a bug where when you save to a newer version of PP, like 2018 or 2020 it does not carry the markers over with all the transcriptions. I've assigned these markers to individual video files that I've already imported into Premiere Pro and as a workaround I exported the markers from the older version of PP 2017 as CSV files but there is no way to import them? How is that possible. Is there a solution where I can import my CSV files with teh markerker data and assign them to their respective files? Please help. It took me weeks to transcribe all of this info. Why can you export but there is no obvious way to import?
I know your question is 10 months old but, as nobody has ever replied, I will still answer it: There is now a free extension for Premiere Pro that can re-import markers that have been exported to a CSV file using Premiere Pro's native marker export. Check it out at http://markerbox.pro
It might be too late for your project, but it might help others struggling with similar tasks.