In order to get a quick overview of which photos & videos you’ve already uploaded from your mobile phone to your myCloud and which ones you haven’t,, you can follow these steps:
Android:
- In the “Photos” area of your myCloud App, tap on the “+” symbol in the upper right corner in order to upload new photos & videos.
- Then select “Upload from device”.
- Now the photos & videos that are not yet in your myCloud will be displayed.
In addition, images not yet backed up to myCloud on Android are marked with the following icon: 
iOS:
- In the “Photos” area of your myCloud App, tap on the “+” symbol located in the upper left corner to upload new photos & videos.
- Now the photos & videos that are not yet in your myCloud will be displayed.