Flowsana's Auto-Adjust Workflow type is the simpler of the two Flowsana workflows that adjust dependent tasks; the Dynamic Duration workflow is the more comprehensive but also somewhat more complex.
The Dynamic Duration workflow is designed for those scenarios where you have a repeating process that you do over and over, and you want to create a template where you enter durations for each task without any calendar dates.
The Auto-Adjust workflow, by contrast, works with projects that already have dates in them, and its operation is pretty simple: if you move a task, and that task has dependent tasks, Flowsana will move the dependents by the same number of days as you moved the dependency (predecessor) task.
This means that for the Auto-Adjust workflow to work, you need to set up dependencies between your tasks. Otherwise, Flowsana will not know what tasks to adjust.
If you aren't familiar with setting up dependencies, you can read about dependencies in the Asana Guide.
At its surface, the Auto-Adjust Workflow sounds somewhat similar to Asana's own dependency shifting capability. There are a number of differences between them, however, which are detailed here: How is Flowsana's Auto-Adjust Workflow different from Asana's dependency shifting?