Update all items in selected Document Set

[whats_my_name]

I am trying to build a flow that allows me to select a document set, and update a property of the items in that docset. 

I can't work out how to start -- is this even possible?

[Brad_Groux]

Yes, it is possible - but with advanced/premium features. These blog posts explain all of the options, and steps for creating and editing document sets:

• Power Automate: Creating and updating a document set in SharePoint – Ben Prins
• Creating SharePoint Online Document Set in Microsoft Flow | SharePoint YCL
• Microsoft Flow: SharePoint Document Set creation » Knowhere365

If you could provide an expanded screenshot of your Flow and steps, your Flow run history, and of any detailed error messages you're receiving we could likely better assist you. Also, for the best results, you may want to review How to write a good forum post.

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