Hello,
I have created a PowerApps application to allow users to upload documents into a secured Sharepoint. The powerApps presents a field with an "upload" button, which then triggers a PowerAutomate flow. This flow prepares the filename, sends a notification email with the attached file, and then tries to save this file on Sharepoint into the document library of a private channel.
When I use the PowerApps, everything goes fine and the file is sent by email and also saved on Sharepoint.
When one of my collegues already having access to this Sharepoint tries the app, everything is also fine.
When another user tries, it fails. My guess it that it might be because this user hasn't already access to this private channel & folder on Sharepoint.
From what I see on every other powerAutomate connector I use, the saving should by done with the permissions of the flow creator - not the user that triggers the flow. My information name is also displayed at the bottom of this step.

How can I get the reason of this 403 Forbidden ?
Thanks for your assist.
Best regards,