Work queue: work through row by row

In the portal, under Environments, click Development and there Open; Flow opens in a new tab. There, click ＋ next to General, choose New workflow and give it a name. A new workflow starts with an Event trigger: the point where it begins.

Choose Work queue in the library (with Flow's other steps) and choose the table. Say which column keeps the status and which values it has for to do, busy, done and failed. Under Column for the error message goes the reason when a row fails. In the steps, the row whose turn it is is called {{task}}.

At the bottom of the queue, choose a step under Add step; here Notification, with the order number from the row: {{task.order}}. In real life you make the packing slip here, for example with an HTTP request.

Select the steps (click the first, and the others while holding Shift) and click Align horizontally: they then stand in one line and you read the workflow from left to right; a branch (such as No of an If / Else) gets its own row below. Fit to view puts everything in sight; then Save.

At the bottom you see every row whose turn it was, and at the end the count. In the table all three rows are now done; a next run finds no open rows any more.