On Facebook using iPhone, why can't I see the content of files uploaded in a group?

[Chicken Chips]

On Facebook using iPhone I cant see content of files uploaded in a group

In a closed group on Facebook I can access and see what is in a file, loaded to that group, on my laptop, and I used to be able to see the information on my iPhone .... now I can open the file but can not see anything.....Why am I unable to see the content of a file???? I have asked if others are having the same issue and they are.... What has changed in the iPhones settings that no longer allow me to see this information?