Users are unable to drag-and-drop files from network directories into container fields

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As part of their workflow, some of our employees prefer to drag-and-drop PDF's into the container fields of our FileMaker database. This works with files in local directories, but if they try to drag a file from a network folder nothing appears to happen to the database. If they use the Insert>Insert PDF command, or if we use the Insert File function in a script, then the files are imported perfectly even if they are in a network folder. I'm curious if anyone else has run into this, or if we simply have something strange going on with our network stack. This happens across multiple computers. All users are on Windows 11. We are using the latest version (20.2.1.60) of FileMaker on both server and clients.