Hi Ken,
Glad you cleared all the comments in changedDirectory GOSUB.
When I tested code, I could not read the files names that had squiggles in middle, so I don't know what to type.
We could set up the code to use same array display for files as we did for Directories so you just find the directory then press f to select file from it, no typing out file name needed, the code is in the best answer for Tiny Navigator!
I was shocked to learn your mouse scroll wheel was not working!