Hi @N03L ,
Is this issue only encountered by you or by all users? And you could also check whether ULS logs have any error messages.
Try to clear the cache here to test if it works:
%APPDATA%\Microsoft\Web Server Extensions\Cache
%USERPROFILE%\AppData\Local\Microsoft\WebsiteCache
Similar post for your reference:
We can't do that because the file is no longer checked out or has been deleted - Sharepoint 2010 Excel 2013
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