issues with swf files

Hi everyone!
I’ve got issues with uploading swf files from Flash cs6 into Animate 2.
I followed all the necessary steps (while in Flash, set the file to export on Adobe flash 7, once in Animate2 unlocked template library and so on …)
All I can see is a series of completely red frames on a gray-spotted background. How can I fix this?

From Flash, try re-exporting it to be legacy compatible with Flash (not CS) 6.
Newer versions of Flash’s methods were not made public.

thank you!