File size is limited to 25MB (scan or physical upload). If you are having issues or getting errors scanning, it is likely the file size is too large. Your scanner settings could be higher than necessary. Most scanners default to extremely high DPI to handle image quality scans, but this results in very large file sizes. For text scans, you can use a much lower DPI setting or save as a tiff file, instead of saving as a pdf. Lowering the resolution, scanning in black and white, and scanning fewer pages are also ways you can create a smaller file.