Access local files on my Xb1

Not gamer stuff. I mean vids ,music,pics and docs that I put on xb1 hard drive. I cant access them now without file explorer and cc player doesn't import my files either

You should be able to access them using the media player app.

Go to Guide>gamerpic>Gamertag>My Profile>Watch>Manage Captures>On this XBox.

From there, if you click the List option (3 lines) you will see all the options available, eg upload to XBLive, OneDrive, Trim etc.

Im referring to files on my xbox hard drive not usb or other external devices

If you play a back compat game on XB1, the 360 save is going to your cloud save. from the xbox 360, when selecting the save location, just select cloud storage and the file from XB1 will be there. From the storage section on the 360 you can copy that
to local USB if you want a back-up, or remove the cloud save and upload a local save if you had a different file you wanted to use, etc.