Can't update filesystem after flashing

[thatbudakguy]

Kind of an odd problem, but it doesn't happen for me when using core micropython (v1.24.1).

After building with make BOARD=M5STACK_Tough pack_all and flashing to the Tough, check the filesystem:

$ mpremote fs ls
ls :
           0 apps/
        1626 boot.py
           0 libs/
           0 res/

Try copying a file to the board:

$ mpremote cp src/main.py :
cp src/main.py :

Nothing happened:

$ mpremote fs ls
ls :
           0 apps/
        1626 boot.py
           0 libs/
           0 res/

The same thing occurs for rm and other commands: nothing seems to modify the filesystem. When using core micropython, the commands work normally.

Is the filesystem read-only, or something? How do I move files to the board?

[thatbudakguy]

When doing something like mpremote edit foo.py, the command will complete and foo.py will briefly appear, but running fs ls a few seconds later, it will be gone. No errors occur.

[thatbudakguy]

The same behavior happens using the UIFlow web UI: I can add a file using the file manager, but when I check again a few seconds later, it's not there.