By following the steps below, you can easily learn how to work on Gradebook offline on your Ultra courses!
Step 1: Click settings image in the right as shown below.

Step 2: Click download grades.

Then set the sections as shown below and click download.

Step 2: Import the downloaded file on Google Sheet as shown on the screenshots.


It will look like this when imported:

Step 3: Enter the grades at the designated areas for each assignment.

Step 4: After entering the grades, download the file in .csv format again.

Step 5: After the download is complete, upload the .csv file on Gradebook as shown in the screenshots.
Click Gradebook Setting and this time click Upload Gradebook.


And just like that, you can work offline on your Gradebook for Ultra Courses.