A sequence represents the succession in which activities are executed within the current state.
The top activity from a sequence is executed the first, and once it is successfully executed, the robot moves to the next one; the bottom activity from a sequence is executed the last.
TAP Studio addresses the complexity of “real life” automation projects through simplicity, therefore each sequence is a state of its own.
This is why you can not nest a sequence in another sequence.
To access the activities inside a sequence/state, you can select them directly from the main canvas, or double click on the sequence, and it will open in a new tab:
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