Hi @Anonymous,
What do you mean by creating a Start Approval action and then reviewing the approval details in SharePoint after the approval is complete?
Currently in SharePoint, it is not possible to directly view the summary of the Flow Approval action. In the Flow, you could view and view the summary.
What is possible is to add a column to SharePoint library and then update this information in the properties.
1. Select the hyperlink type for the type of column, then use Select to get the relevant information of Approval result you want to view, and then save it in a table.
2. Use the contents of this table as the content of OneDrive-Create file. Create a web url for the file using Create Share link.
3. Finally, configure the web URL as the content of the column.
Image reference:

The action that the If no branch needs to configure is almost identical to If yes, except that the approval status needs to be changed. I have not configured Set content approval status here, you could configure it yourself.

Result, Click on the link to view the content:

Please take a try.
Best Regards,
Barry