Version 2.4.1

functional improvement

Manage contents
1.In the downloadable materials, the description was changed to be optional instead of required.
Learn Contents
1. Changed to keep a new grade each time you download a downloadable material.

Bug Fixes

Group management
1. Resolved the issue where the custom field feature would not save when using IE and creating or modifying custom fields.
Learn Contents
1.Fixed the problem where a corrupted file would be downloaded when downloading materials that have already been downloaded and have a status of "Already Learned" in the Downloaded Materials function (a function that allows users to download any materials).