When importing grades via CSV file into the gradebook, does the import action overwrite the allowable fields, or does it just add or revise the contents of those fields? As context, let's say:
- At 10 AM, I export a gradebook in order to batch-enter grades for a manually-graded assignment. In the exported gradebook, a student ("Maria") has not yet completed an auto-graded activity; therefore, the field that captures that grade is empty.
- At 10:05 AM, Maria completes the auto-graded assignment mentioned above.
- At 10:15 AM, I import the modified CSV file.
My question: Does the imported CSV overwrite Maria's grade for that assignment (replacing her score with an empty field)? Or does the CSV simply affect fields in which there is data in the imported CSV?