Many ingestion errors are triggered by improperly formatted CSV files. The formatting issues are commonly caused by Microsoft Excel not following UTF-8 and CSV guidelines. To resolve, upload your file to Google Drive, converting to a Google Sheets Doc, then download as CSV:
Upload your file to Google Drive with settings to convert uploads checked.
...
Download the new Google Spreadsheet as CSV.
...
Create a new ingestion using the CSV file downloaded from Google Drive.
...