Is there a limit to the number of images that can be uploaded into PSM?

Access does have a 2GB file size limit, but this would never be reached by the audience using PSM.  Images for instance cannot be physically stored in access and to make things work efficiently, technically speaking we are just linking (not attaching or embedding) to the pictures stored in another spot on your computer.  We have tested single batch uploads of up to 2,500 picture files at once with no performance problems.