As of Adobe Experience Manager (CQ) 5.5 and later, changes to the metadata of an asset are written back to the original binary as part of its XMP metadata. Write-back is enabled by default, but it is not supported in all operating systems. In those operating systems, Adobe recommends that you disable the write-back to prevent DAM workflow failures.

Check here to see if your operating system is supported.

Solution

• Click the + sign for Supported Formats and leave it blank (Don't enter any mimetype) at [1]
  
• Remove all the mime types configured for writeback at [1] except the one added earlier. 
• Once you update the configuration, restart the system for changes to be effective.

OR

Install the attached package and restart the instance.

[1] http://<host>:<port>/system/console/configMgr/com.day.cq.dam.core.impl.handler.xmp.NCommXMPHandler

Note for 64-bit Linux users :

The AEM Metadata write-back workflow uses the XMPWorker Linux fragment which is a 32-bit native executable application that AEM runs on the OS shell.  

If you are using 64-bit Linux, then it is possible that you do not have the dynamic runtimes installed to execute the 32-bit library. This other article provides steps to install the required 32-bit libraries in Redhat Enterprise Linux or CentOS.