To add an image or a document to a new article, discussion or a reply, go to the editing tools, select Insert, then select Image/video/file. Paste a url here or click on Upload to search the files on your computer.
Select your file, then click on OK. Please keep in mind that the file will be attached where your cursor is in the post/comment.
All commonly used document formats are acceptable to post (Word, PDF, Excel, PowerPoint) and large files should be able to upload.
If you have any questions or need assistance to upload a file, please contact me directly at: firstname.lastname@example.org.