I've assembled a first album into a GME file, copied the GME file to the pen, and printed the control sheet.

The pen recognizes the pattern on the control sheet, however, it tells the audio files are not available.

As I've read on the tttool issue tracker that it might be necessary to set the language tag to the one of the pen, I've re-assembled a GME file with the language tag set to our pen (FRENCH). It does not however work any better.

Any ideas how I could debug that?