A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hi Stephanie,
Thanks for posting in our forum.
We understand that you want to create a document library based off a custom list template with Microsoft Flow or SharePoint Designer. We have a specific support channels for Microsoft Flow and SharePoint designer and we’ll suggest you post a new thread in these forums for expert assistance.
Thank you for understanding.
Regards,
Neha