This satursay i worked on editing an existing drawing

I've added new ducting and new notes saved and then closed drawing.

 

Today i oppened the same drawing and on the preview window i see everything i've added last session but when i open the drawing all of the new stuff ive added is not there and stuff ive deleded in the last session, are still deleted thats where its odd.

 

can someone help me.

 

Pierre