Professional :: Make Flash Use The Original Photoshop File, Not A .png One?

I'd like to draw key frames in Flash, just simple drawings/skelettons using the pen tool, basically to create the movement itself. After that, I want to export the frames that I drew as images to Photoshop in order to apply texture and colour, and then put them back into Flash again, without tampering with the Flash doc I've already created, since the animation is already done. I want the file(s) that I'm working with to remain the same files throughout the process, from Flash to Photoshop and back to Flash again, like the way InDesign works. Is this even possible?
 
If this isn't possible at all, I guess the alternative is to draw in Photoshop and then import the drawings into Flash, put them in order and then make any eventual changes after you've created the animation in Flash, this is less smooth though still possible. But here emerges (sort of) the same problem:
 
When I import images from Photoshop, create animation out of them, and then realize I have to make some changes in the original PS pic file I head back to PS to correct it. But it just doesn't work the way I want it to... If I modify the pic file in PS, then use the "update" alternative in Flash Library, Flash just tells me that the file can't be found, and does not update the image. If I choose the "edit in PS"-alternative from right clicking on a symbol that is in the library, the file opens as a .png file in PS, not as my original file! It seems to me that Flash is creating its own library, not using the existing document. Is there anyway to go around this? How do I make Flash use my PS file which allows me to change it as much as I want (as with InDesign)?
 
This is driving me crazy, what I'm working on is supposed to be full HD, I can't use a freaking .png file...