maybe try a smaller sized picture? typically I use Camera fv-5, it is free to use for most settings. It allows you to reduce the overall size of the photo before you take it. In Memento when you go to take the photo you are given the option which app to use, in fv-5 choose settings/image resolution, where there are lots of different sizes to choose from, 640x480 is a good choice. Fv-5 will then remember this setting. For a small fee other settings such as Iso are also available, which further reduces file size