I am able to scan on the C75 and it creates the file. When I connect through the C75's IP address, I can see the document in the Docs tab. However, when I click on the filename, it now says Preview Not Available and when I try to download the file, a pop up window says "Not able to save document." This is a recent development, as we have been successfully downloading scans on the C75 for 3+ years. Any idea what could be causing the problem?
Sadly this is what happens when the mailbox corrupts.
You could try getting the jobs via the software (Fiery Remote Scan) instead of the webpage, but it is probably a lost cause.
Assuming nothing critical is on there, just clear out the mailbox of all scans (CWS5 > Server > Clear Server > Scan).
Reboot and try another scan.
If it doesn't begin to work on the new jobs you would need to create another mailbox to use or reload the Fiery.