Regarding WPLMS Assignments Upload Assignment Functionality : It seems like your PHP installation is missing “mime_content_type” or “finfo_file” functions which are crucial for detecting file types of uploaded attachments. Please update your PHP installation OR be very careful with allowed file types, so intruders won’t be able to upload dangerous code to your website!
As the message states, if your server does not support above functions as detected by the assignments plugin, we do not recommend using upload functionality in assignments. If you plan to use the upload functionality in assignments, please contact your web host to enable these functions on site.
If you do not want to user assignments upload functionality, you can simply click on dismiss to remove the notice from the WP Dashboard.