Transferring files???

Hey all, I have Oneplus 3 rooted and running stock rom. When I connect it to my Chromebook the only thing I have access to are the driver files, none of which are useful for chromebook. The same problem occurs when I flip over to Linux on the Chromebook. I have installed adb on the Linux side and had no trouble rooting the phone. But how do I access the phone's file system??

Thanks

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