Teams- Classnotebook - not visible PDF/Pictures

I have been using Teams Classnotebook with no trouble the past 6 months.  I consider myself quite "techy".  The past few days our ClassNotebook pages do not load.  (Gives that picture type of display)  It does not matter if I insert/ copy paste or insert picture.  None of them work.  I have tried everything.

Help! Anything happening! ????