ArtRage for Android allows you to import images to create new paintings from other apps on your device (for example, the default Gallery and Photos apps, Dropbox, and other apps that support image export, like Autodesk Sketchbook).
Interacting with other apps is controlled by the Android operating system, not ArtRage. If you chose to set one of these options as the default option and now need to use one of the others, you can reset your default settings in the other application’s settings.
For example, if you have set ArtRage to always import from Dropbox, you would reset your Dropbox default settings (note: this will also reset any other apps that default to Dropbox). Simple go to your Application Manager > Dropbox and look for the ‘Default Settings’ section and reset it (you may also be able to go to Settings > Default Applications > Set as default > Dropbox).
Note: The exact names of the menus may vary on different devices, but the path will be the same.