You cannot drag multiple files in to the upload bar on the hand-in page.
However, if your teacher has allowed it you can create a zip-file, that contains all the files you want to hand-in.

To create a zip-file, first create a folder. The name of the folder will become the name of the zip-file. Put the files you want to hand-in in to the folder you created. There should be no other files in the folder (other than the files you want to hand in). 

If you're on a PC using Windows, right-click the folder and in the menu that appears you should select Send to and then under that menu select Compressed (zipped) folder.
You then should see a zip-file with the same name as the folder you created appear. You should drag this zip-file in to the upload bar on the hand-in page. If your teacher has allowed handing in zip-files, the file will upload.

If you're on a Mac or Macbook, right-click the folder (or hold down Ctrl while clicking the folder). In the menu that appears choose Compress "folder name". You then should see a zip-file with the same name as the folder you created appear. You should drag this zip-file in to the upload bar on the hand-in page. If your teacher has allowed handing in zip-files, the file will upload.

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