Using the Save Copy In command to save to session formats lower than Pro Tools 10 converts all audio for sessions with
interleaved files (PTSW-152737)
When saving a Pro Tools 10.x session that has a mix of interleaved and non-interleaved (multi-mono) audio files to a lower session format (such as Pro Tools 7–9 “.ptf”), all audio files are converted (even if they are not interleaved).
Using the Save Copy In command from Pro Tools 10 (.ptx) to Pro Tools 9 and lower session formats cannot link to audio files
with names including certain characters (PTSW-163844)
In sessions containing tracks or files with special keyboard characters—such as “$,” “%,” or “#”—using the Save Copy In command to
save to Pro Tools legacy formats is not supported and may result in problems copying files. To avoid this issue, rename any tracks or
audio files containing special keyboard characters before saving a session in a legacy format