How do I work with the Activity, Task, Event objects in Apsona? I can't find the Activity object.

The Activity (task/event) object is a little different than most, mainly in that the lookup field from the activity record to the parent record is "polymorphic", ie: the lookup field is not object-specific and can be linked to any object where activities are enabled. SOQL queries struggle with polymorphic lookups. Since Apsona uses SOQL queries to communicate with Salesforce, it handles this issue by taking the Activity Object and 'splitting it up', creating object-specific versions of "Tasks" and "Events". 

If you look up 'task' or 'event' (which are the various incarnations of Activity) you'll see object-specific versions:

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When creating filters or reports in Apsona be sure to use the version of Activity that has the prefix of the object you are linking it to.

For more details about Activities in Apsona see this article.