"There is not enough memory to complete the operation."
Hello,
I'm working on an Adobe Animate file. It's not very complex, but there are a ton of symbols. When I try to combine the symbols into a single layer, I keep getting this error message:

I tried updating to the latest version (I was on 2017, previously), trying the (previous) 2020 version, deleting preferences, uninstalling/installing, etc. I can't figure it out.
If I save the file at this stage and reopen it, I get this error message:

Please let me know if anyone else has had this problem! It's driving me nuts.
