Failed to upload illustrator file to adobe express

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Hello,
I'm trying to upload Illustrator file to Adobe Express, but it's converting very long:

and then it just fails:

I've already tried different browsers (Google Chrome, Incognito mode on Google Chrome, Microsoft Edge) but it's always the same. I've also tried deleting browser's cache and cookies, also switching to another network and restarting my pc. I have no clue now what could be the issue, nothing seems to work.
I've previously uploaded similiar files and there was no problem. Thanks for help in advance.