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I tried to open an inDesign document and the error message: Cannot add data to "unknown document" appeared. What does this mean and what do I do?
This can happen if trying to open an InDesign document in a different version than it was originally created in.
If the file is on a server, download it to your desktop and try opening it. Make sure that the file has the proper InDesign file extension.
If that doesn't work, Markzware has a recovery service which may work for you. https://markzware.com/products/file-recovery-service/
Otherwise, you may need to rebuild the file.
Hi. I had the same problem on ID 2021. I was about to give up when I tried to open the file as a copy. With that, the program looks for another recent backup file and opens.
Open a File> Normal, Original, Copy
In the selection box choose copy
Hug from Brazil