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I don't see this Autofile button ??

Это отзыв для предыдущей версии этого дополнения (1.1.7). 

On July 7, 2021 we exchanged e-mails and on July 8 we found the issue: there was an incompatibility with an old Thunderbird extension which was not compatible with Thunderbird new API and prevented the addition of new buttons. Disabling the extension solved the issue.