Symbols in Layer in Lipsync Mapping

When I go into Lip Sync Mapping and try to select the ‘symbols in layer’ box I cannot click it and it remains on ‘don’t use any symbol’. If anyone knows how to fix it, it would be greatly appreciated.

I think ‘symbols in layer’ box is only available when your destination layer is a symbol, which is an Adobe Flash format.

Do you really need to use symbols as no body use them now a days?

If you are simply having an issue to make Lip Sync to work, make sure each of your drawing is named in the exact way required by Lip Sync. (A, B, C, D, E, F, G, X)

How to rename Drawings: