Attempting to post in Neighbors and cannot upload picture

I am attempting to make a post in Neighbors. I click on new post and selecte Lost Pet. Then click continue. I type in a title and then information about our lost cast, however when I go to upload a picture of our missing cat I select Library. It takes me to another screen title Camera Roll, however no pictures show up to select, I just get a spinning wait/processing image in the middle of the blank screen. Please assist. Thnank you. Rhett