Sometimes it may not be possible to upload/restore a larger course in your Moodle directly through the admin area.
To avoid this issue, you should try uploading your course using your favorite FTP client.
Basically, the steps you should follow are:
1. Establish an FTP connection.
2. Navigate to the corresponding course folder (e.g. /home/user/uploaddata/2 - each folder number corresponds to a certain course).
3. Upload the course backup archive in that folder using your favorite FTP client.
4. Log in to Moodle as administrator.
5. Go to the corresponding course.
6. Go to "Restore"
7. Navigate to the desired file and click "Restore".
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