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Adobe officially does not support working off non-local sources.
https://helpx.adobe.com/illustrator/kb/illustrator-support-networks-removable-media.html
Something may have interrupted when saving to your external that corrupted the file.
This is the risk in working on an external drive.
Check for updates for Illustrator and Windows to make sure that does not resolve.
Otherwise, I would email your file to the address indicated on the message and see if they can assist.
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