To delete a file, the initial post in which the file was posted must be deleted. To find this post, simply click on the relevant document in the data file and then on the source. You will then be redirected to the post in which the document was posted.
Next, select the three dots on the lower right-hand side of the post. A drop-down list will open where you can click Delete.
Another way to delete a file is to edit it instead of deleting the initial post. To do this, click on "Edit" in the selection list. A window will appear in which you can edit the post. Then click on "Publish" and the file will be removed from the post.