InDesign file (.inddc) won’t open – app crashes instantly without error (v20.2 & 20.3) - urgent

Hi everyone,
I’m having a serious issue with an InDesign document (.inddc) that suddenly won’t open anymore. As soon as I try to open the file, InDesign crashes immediately without showing any error message. I’ve tested this in versions 20.2 and 20.3 – same result.

Here’s what I’ve already tried:

• Reset InDesign preferences

• Restarted my computer

• Uploaded the file to the Creative Cloud

• Shared it with a second Adobe account

• Transferred the file to that second account’s files

I also tried accessing and downloading the file both via the Creative Cloud desktop client and via the browser, but no luck – the file can’t be opened or downloaded from either account or interface. Still no specific error messages.

Has anyone experienced something like this before or found a way to recover a file in this state?

Any help would be greatly appreciated!