If I understand correctly, your photos are grey and they have a cloud icon on them. This may have happened if you have iCloud Photo Library enabled or you are optimizing storage. I would recommend you read this article and use it to help troubleshoot the issue.
If you turn on Optimize Storage, iCloud Photo Library automatically manages the size of your library on your device. Your original photos and videos are stored in iCloud and space-saving versions are kept on your device. Your library is optimized only when you need space, starting with the photos and videos you access least. You can download the original photos and videos over Wi-Fi or cellular when you need them. You can use Optimize Storage on your iPhone, iPad, iPod touch, and Mac.
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