You're right Witto, it is.

I've searched but there doesn't seem to be a single folder on a default-perm'd system drive where Users can share stuff with write access. It is always creator/owner and read for the rest.

So as suggested, a srv-share or a GPO-permission set folder seems like the only way it seems.

Shouldn't this be considered a... blunder in the permissions-design? ;\)
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The tart is out there