Notes on saving images
No images can be saved in this app. The save destination is the camera roll, which can be viewed from the standard app "Photos".
How to save imagesTo download an image from the site you are browsing, touch and hold the image to open the option selection screen, and then tap "Save Image" to save the image to the camera roll.
When saving for the first time, an alert will appear asking if you want to allow access to the camera roll, press "Allow".
When you don’t allowAfter you press "Don't allow", you will not be able to save images again next time.
If you've press "Don't allow" but now want to save it, you need to change the settings from the standard app "Settings". Select Settings app → Privacy → Photos → CalclatorR → Add photos only.