Hi @g.pointereau, thanks for posting in the Lucid Community! I would recommend trying the export in a Chrome Incognito browsing session. This often improves performance by clearing your cache and cookies and disabling your extensions.
Sometimes issues like this can also be related to internet connection speed or network security. Please also try the export again on another network, ensuring that you are on a strong, stable connection. If the issue continues to persist, would you mind sharing a screenshot of the error message you are receiving? I appreciate your help and patience!
For others who may be interested, please review our Export Your Lucid Documents article from the Lucid Help Center to learn more about how downloading/exporting your document should work.