We are trying to develop a flow for a SharePoint blog post. When a blog post created , the flow should read the new blog post and create in another site.
For this exercise we have created a flow in SP site on blog post and whenever the flow runs, it fails with below error in first condition itself.

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Trigger 'When an existing item is modified' failed
Fix It
To make this flow work, inspect the inputs to this action and ensure they would provide the correct inputs.
Error type
This action failed because the inputs provided were not valid.
Error Details
The error message from the service is below. This maybe useful for support:
The query to field 'NumComments/PostTitle' is not valid.
clientRequestId: e5ff48f3-c369-42f6-9bec-f74464c4e395
Please let us know whether blog post create/update is supported by Microsoft Flow or not.
thanks
Prakash