In case it becomes necessary to do a reset or a clean install which will wipe files, here is a way to back them up...
(a) Plug in a USB drive on which to copy your files.
(b) Get to the Recovery Environment, I.e, boot to the Win 10 Installation USB drive,
& click to "Repair your computer" (instead of to install).
(c) At the "Choose an Option" screen,
click "Troubleshoot > Advanced Options > Command Prompt".
(c) Enter Notepadat the Command Prompt. It opens in GUI mode.
(d) In its File menu, select Open.
(e) Set Notepad to display all file types with its requestor at bottom.
The files you want are likely in the folders at "C:\Users<your user name>". Remember to Refresh the screen after a paste. Additional notes...
o Notepad's left pane has only "Quick Access", "Libraries", & "This PC".
o Click This PC to switch from C: to the USB drive & vice versa.
o Double-click a drive or folder in the right pane to open it.
o Right-click a file or folder, & select Copy. That seemed instantaneous.
o Go to the USB drive, right-click in Notepad's right pane, & select Paste.
I had an hourglass for just about a minute - or was it two - for 1.3 GB.
o When the normal pointer reappears, right-click in the right pane, & select Refresh - or I think you never will see it.