@Dean Hoile, Thanks for posting in Q&A. Based on my checking, currently, there's no setting in Intune to controls what files and data can be transferred via USB.
https://learn.microsoft.com/en-us/mem/intune/configuration/device-restrictions-android-for-work
You can feedback to Intune voice to see if we can get this in the future:
https://feedbackportal.microsoft.com/feedback/forum/ef1d6d38-fd1b-ec11-b6e7-0022481f8472
Thanks for your understanding.
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