I'm going to remove ballistics.zip because all the files have been unpacked from it and it's now just taking up space:

Click on the little box immediately to the left of the file you no longer want and a little tick appears in it. If you tick a box by mistake then click on the box again to untick it:

2. Click With chosen files... at the bottom of your list of files and select Delete completely from the list:

3. Moodle now displays the name of the file you selected and then double-checks with you if this is the file you definitely want to delete:

4. If you are absolutely sure you want to delete the file click Yes.

When you select which files you want to delete, you can tick more than one before choosing the Delete completely option.