Re: Workflow - to a review panel - only one person required to approve then 2nd stage to final appro
Hi @Brice235i,
Do you want to create an approval flow when a file is created in SharePoint library?
Do you want to send the approval email to different people depending on the file name?
About your first level of approval, please take the following for a reference.
In the Assigned to field of the action Start an approval, insert the following code. It will return different people based on the file name.
if(contains(triggerBody()?['{Name}'],'test1'),'test4@contoso.onmicrosoft.com',if(contains(triggerBody()?['{Name}'],'test2'),'test2@contoso.onmicrosoft.com','test1@contoso.onmicrosoft.com'))
If yes, send an email to file creator, update file properties to Pending Scheduling Superintendent Review. If no, send email to file creator, update file properties to Rejected.

Please take it for a reference and try with your second level of approval.
Please feel free post back if you need more help.
Best regards,
Mabel Mao