A simplistic application that allows you to import images and videos from a camera or any device that supports PTP/MTP. All that is required is an OTG cable and compatible Android device.
Simply connect the camera to your phone and select it from the device list. A list of available images with thumbnails will be loaded. Select the files you wish to copy and then tap the menu and select "Import Selected" or select "Import All" to copy all files to your Android device. The files will then be copied to the selected storage device.
The storage device can be specified in the settings. The folder to save to can also be selecting when using "Custom Folder" (thanks to Matthias Brandt). The folder can be on an external SD-Card or Internal storage (if supported by your device).