Getting better bitmaps out of flash publish options

Hello all,

A quick question here, I’m doing a t shirt design to submit to threadless and my problem is that I created the shirt in flash (they have a flash template), but they require a thumbnail that’s 100X70 pixels and any bitmap format I export from flash has such low file resolution that the design is no longer legible. Are there any options or tricks I’m missing here for getting a better resolution output from flash?

Thanks in advance!