Samsung Android devices setup with Knox Container Only Mode (COM).
USB connections are not allowed in COM. How are files transferred out of the COM?
There are two options to get files out of COM:
1. Email - For smaller files you can email them to yourself and access them on an external client.
2. Configure a cloud storage app in COM - e.g. you can setup Google Drive and upload the files. These files can then be accessed on another client.