It is not possible to trigger manual synchronisation between devices on iOS MindMeister. However, you can enable real-time collaboration. This feature makes your MindMeister mobile app sync more frequently with the server, allowing you to collaborate seamlessly. This feature is enabled by default.
To enable real-time collaboration, check out this article.
Note
It is not possible to enable real-time collaboration on Android devices. This is an iOS-only feature.
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