How to use elevated permissions in SPFx?
Sarang Gidde
Select an image from your device to upload
Same as RunWithElevatedPermissions in SharePoint OnPremise, How can we implement impersonation in SPFx webpart?
https://social.technet.microsoft.com/wiki/contents/articles/51661.sharepoint-framework-spfx-webpart-with-elevated-privileges-using-ms-flow.aspx