Thank you @Rahul_Unnikrishnan and @lepumin. Your solution works! As @lepumin indicated, the Parallel Misc. Condition must be set True.
Here is the workflow I use:
Additional Info:
Before setting this up, I was under the assumption that each Parallel branch had to finish before the next Parallel branch would execute. However, this is not the case.
It would be helpful for someone to add the relevant UiPath documentation link for the Workflow->Control->Parallel (pressing F1 on this activity takes me to the MS Parallel Class documentation).