Hi Brillian,
Based on your description, I wanted to ask you several questions about your problem.
- Which version of Excel are you using?
- Did this issue appear in all Excel files or a particular file?
- Where did you open the shared file? From network or other path?
- Can you modify the file without problems?
- Could you provide the whole error messages when you tried to save the file?
If this issue appear in network, I suggest you check the permission for accessing the network.
Then please refer to the KB article about "How to troubleshoot errors when you save Excel workbooks":
https://support.microsoft.com/en-us/kb/271513
Please provide more information about your issue, I'm glad to help and follow up your reply.
Regards,
Emi Zhang
TechNet Community Support
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