Hi @Chelsea_Meyers! Welcome to the Forum 
Sorry to hear you are running into this issue and thank you for trying to troubleshoot it.
Can you please confirm you have editing permissions on the Project you are trying to import the CSV? You can verify it by clicking on the “Share” button next to the Project’s name.
If this is not the case, I would recommend you to reach out to our support team with the URL of the Project and your CSV file, so they can try to reproduce and help you resolve this issue!
You can reach out to them following these steps. When you do, feel free to reference this thread so you don’t have to re-explain everything.
Thank you so much for your patience and cooperation! Let me know if there is anything else I can help you with!