The location of file attributes is configured in general.properties
file as described in this article:Where to find WorldServer Project File Attributes on the server
If you want to quickly check the current and valid folder path, upload any test file to a project as project attribute. Then hover your mouse over the attachment. You will see the path as part of the URL. See screenshot below for clarification:
You can do the same thing with the attachment that cannot be downloaded, in case you do not know where the "old" attribute folder is stored on the server.
To solve this problem, copy the content of the "old" attributes folder to the new one. Alternatively, change the path defined in general.properties
to point to the old folder or to a different folder. After the change, restart WorldServer (Idiom Service). All attribute files need to be copied over to the new directory.