Thank you for your reply.
As I mentioned in title this button is appearing randomly. For example: yesterday I received information "thank you for fixing export!" and few hours later "it is not working again". I checked audit logs and nothing changed for this user (including permissions to project, groups, etc.).
I want to know how to make it works permanently - do you have any other ideas what should I check? Maybe you've heard about add-ons which are blocking this feature?
I'm not aware of any add-ons that might block it, but that does not mean there aren't any.
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