Probably the wrong group, but...please help!

Randi • In love with my best friend. ❤ 5/26/18 👰🤵 Mama to the perfect baby boy born 11/14/19👶💙

When I try to post a picture on glow I can only access photos I have taken with my camera app. Anything I've saved from Snapchat, screenshotted, or saved from messages or Google doesn't show up. I have a Google pixel if that makes a difference. Can anyone tell me if I can fix it? 😂