I’m a brand new InDesign user trying to work with InDesign files created by a consultant and provided to us to maintain.
When I try to open any of the indd files, I get the message – "Cannot open the document <doc name.indd>. You may not have permission or the document may already be open". I tried opening the idml file instead. It opens and shows me the document. However, when I make changes there and save it, Windows Explorer shows me the indd file is being updated but I still can open only the idml which does not reflect the changes I just made.
Answered in the other thread....
Open the .idml and do a Save As with a new name.