This morning (10:40) I uploaded 4 jpg files (I have 95% file space left); they indicated successful upload, but when adding them to a Canvas page the image showed on the draft page, but not on the "saved" page; the file link was inoperable. I tried re-uploading a file, but then got the error message. Four jpg files uploaded with a "green check" indicating success are not viable; their links don't work. I tried a 5th file but only received the fail -503 message. I just read that this has been fixed...?