Before you can post, you have to allow display access to your photos first.
In order to grant access please follow the below steps.
For Android:
1. Open to Device Settings
2. Go to Apps & Notifications
3. Tap on ‘See All Apps’
4. Select display and tap on ‘Permissions’
5. Make sure the ‘Camera’, ‘Contacts’, ‘Microphone’ and ‘Storage’ is set to ‘Allowed’
For iOS:
1. Open to Device Settings
2. Scroll the page all the way to the bottom where it shows the list of Apps installed on the
device.
3. Tap on display
4. Turn on the button next to ‘Contacts’ and ‘Camera’