Why does the file in Illustrator become a symbol when I paste it into Animate?

As shown in the picture, the correct result should be that the element pasted into animate is a group, not a movie clip wrapped with a mask.
I have no problem operating the same file on my own computer, but my friend encountered the problem shown in the picture.
Whether it is imported into ai or directly copied and pasted, it will appear in animate as a symbol. The symbol needs to be broken up into each element, which is annoying.
I did a simple test and found that it has nothing to do with the software version.