What are the requirements for scanning receipts for upload?

Although PDF is the recommended file type for scanned receipts, the following file types are accepted: PNG, JPG, JPEG, HTML, TIF, and TIFF.
Each image file must be no larger than 5 MB in size.
Set scanner resolution at 72 dpi (dots per inch) to keep image size smaller and improve upload time.
A maximum of 10 image files may be selected per upload session.
A report can have multiple upload sessions.
There is no limit to the number of image files that can be uploaded using multiple upload sessions.