Error Importing CSV Collection with Custom Pack Data

I am currently part of a progression draft where we recently added a custom pack to spice things up.
Due to some circumstances I saved my collection as a CSV file and deleted the collection in my account page.
Now that I'm done with what I was doing I wanted to reimport my collection from said CSV file, but the page shows an error that it can't handle the "Custom_" tag in the csv file, so importing does not work.

I am currently trying to find a work around to edit the CSV file so that I can at least import the regular pack data and then add in the custom pack cards manually, but it would be nice if that wasn't necessary for this.

Hey there, can you send the .csv file to [email protected] and I will investigate. Thanks!

Thanks for response  world of mario