It’s too bad that doesn’t work.
This isn’t the best solution, but maybe it can help.
Hit the ~ key to take the Project Panel full screen.
Open all directories. Click File Path to sort by file path.
This should put all Missing files together (within their folder directories) and list their previous locations.
Take a screenshot or however many you need to cover them all..
Are you adding interactivity in Flash or in any other way using Flash’s strong points?
If not, not only is this step unnecessary, it is probably detrimental to your workflow.
AE is intended for video. Flash works with video fairly well, but that isn’t its strong suit.
You can certainly add audio in AE and render directly from it. You will also have more render options than Flash will offer you.