Welcome to the Discuss community and pardon my delay in response to your question!
I appreciate you sharing context to the missing purchase histories. We have some step-by-step instructions to verify your steps to import CSV files on our PrimeXBT integrations page.
Additionally, please connect with our support team if the missing transactions persist! We’ll be able to further investigate and help bring the remaining transactions in.
Thank you again for shining a light on this, Kent!