If you are looking to attach supporting documents for an agenda item, simply open the agenda item, locate the file that you are looking to upload, drag & drop them to the agenda window.
Alternatively, you can select "Attachments" from the menu bar which appears when hovering over an agenda item and then select "Attach files". This will open your Folder to locate and upload the desired document.
Note: Users are able to view a preview for images and other files may have to be downloaded in order to view. For the best experience, please ensure the files that you are uploading are less than 10MB and if the files are bulky you can always add a link to the agenda item.