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Try either Control/Clear Publish Cache, or do a Save As.
I don't know who marked this as 'correct answer' but it didn't work for me!
I took a brand new file full of jpgs then tried the above suggestion. Then for good measure deleted ALL the content from the FLA file and emptied the library. I then tried clearing the Publish Cache and Save As. The (totally empty) FLA file is still over 50 mb!
The answer was marked as "helpful", not "correct".
I've tried to make an FLA go wrong like this, and can't manage it. Would you be able to post your empty FLA somewhere?
I copied all the frames from my original file into a brand new document (using Copy Frame/Paste Frame) and that seems to have cured the problem. I can only assume that there was something corrupt in the original file that wouldn't go away!
It's odd that the issue also happened to me with a new file earlier, but I have it fixed for now.
Thanks for your help/suggestions worth knowing about the Cache clear feature for next time !
One interesting thing I discovered in my tests is that if I imported a bunch of images and did a save, the FLA was a certain size. If I did Undo, Redo, Save, the file was half the size! Flash has a sense of humor I suspect.
Incredible BUT true. I did the same (though I had to save after the 'undo' before the 'redo' to make it work). This reduced the file from 105880kb to 52944kb.