Hi @Anonymous,
Do you want to send one email notification when a new folder is created in your SP library?
The "When a new folder is created" trigger is not supported in SharePoint connector of Microsoft Flow currently, if you would like this feature to be added in Microsoft Flow, please submit an idea to Flow Ideas Forum:
https://powerusers.microsoft.com/t5/Flow-Ideas/idb-p/FlowIdeas
I assume that there may have some new folders are created in your SP library every day, you could consider create a separate flow to get all folders within your SP library, then check if there are some folders are created in current day. I have made a test on my side, please take a try with the following workaround:
- Add a Recurrence trigger, Interval set to 1 and Frequency set to Day. At these hours set to 23 and At these minutes set to 59.
- Add a "Get files (properties only)" action, specify Site Address and Library name.
- Add a "Apply to each" action, input parameter set to output of the "Get files (properties only)" action.
- Within "Apply to each" action, add a Condition, click "Edit in advanced mode", type the following formula:
@and(not(contains(items('Apply_to_each')?['{FilenameWithExtension}'], '.')),equals(formatDateTime(items('Apply_to_each')?['Created'], 'MM/dd/yyyy'), utcNow('MM/dd/yyyy')))
Within "If/yes" branch of Condition, add a "Send an email" action.
Image reference:

The flow works successfully as below:
Best regards,
Kris