Hi @Plunder
Moved your question from the Charge to the Third-Party Integrations section since being more relevant to the topic.
When Activetrac doesn't support Fitbit Integration (to upload data, activities..) from their app.. to Fitbit.. feel free to contact the support team of Activetrac.. so they can consider to develop the integration of Fitbit with their app..
Fitbit allow third party developers to integrate such functionality (like uploading foods eaten from another app such as myfitnesspal does), though fitbit doesn't has control over, and the third party developer must add the function into their app to link with Fitbit.
