Files that have been uploaded can be deleted individually or in combination with other files.
If you want to delete one individual file or several files, click onto the file or select the files. You can do this by pressing and holding the left mouse button, then move it over the files which you want to delete. You can release the mouse button after you finished highlighting the files. When you right-click a window will open and you can select "Delete file".
You can also delete files by using the garbage can icon located in the upper bar.