The disk where you are trying to save the file has a limitation on file sizes. Please try saving a smaller file or saving it to a disk that does not have this limitation.
Mae gan y disg lle rydych chi'n ceisio cadw'r ffeil gyfwng ar feintiau ffeiliau. Ceisiwch gadw ffeil lai neu gadw at ddisg sydd heb y cyfyngiad yma.