What operating system are you running?
I'm running Windows 7 Professional; 64 bit.
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Are you saving these InDesign files to a cloud-based location? Or opening it from there on multiple computers?
I ask this because almost universally when you cannot save a file, but you can always save as with that file, it means there is a conflict between the previously-saved file and the InDesign-created temporary file which holds changes made to the document.
There are a number of reasons why that would be, as well as options for fixing the problem. Sometimes it's a conflict between file types/suffixes between InDesign template and document files. Sometimes it has to do with network file privileges and stepping outside those privileges when working with InDesign files. Generally, it happens by juggling InDesign files between cloud locations and local/network folders.
We'd need some more information from you to discern which situation(s) apply to your problem, because what you're doing to create the symptoms will determine what fixes will cure your problem. I've got my suspicions, but it's hard tellin' not knowin' your specific situation. With more information, we can help you find the cure.
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I suggest speaking to your network administrator to see if the network software being used has been updated to be compatible with CC 2018. Since you are still working on Windows 7 it seems likely that your network has not been updated and could be quite old. Aside from that I would suggest working locally and backing up to the server at the end of each work session.
We are working from a local server system with company wide access but with no outside access.
My department is the only one who works with the InDesign documents, and no two people at the same time.
I have no idea what I'm doing to create the symptom.
I'm just creating the document and when I want to save it the error message appears.
With the CC 2017 version everything worked fine.
Also consider "time stamp" problems of the open files on the server compared with your local machine: The InDesign document plus the corresponding idlk file that is generated when you open the document and will removed when closing the document.