Attachments can be added to an issue directly from the add-in. To do so, from the add-in, click on an issue to edit it and select the attachment tab in the right-side panel. Click "Browse" and select a file from your computer. Please note that it is also possible to drag and drop multiple files directly into the download zone. Once the files have been selected, simply click the "Post" button and your files will be uploaded and attached to the issue. You can also delete obsolete attachments by clicking the 3 dots next to them.