Hi @teleute
I would suggest that what you are asking is achievable and I would start a new blank Flow withe the following trigger:
The entity will be "the full URL to a file in Sharepoint." and then after that something like this.

Here is more detailed information on updating SharePoint Document Library Properties
https://flow.microsoft.com/en-us/blog/support-for-sharepoint-document-library-properties/
There would need to be some connectors used to change the properties or metadata of the file in SharePoint but I am hoping the above link will get you closer.
I don't have dynamics set up in a way I can recreate this for you or I gladly would, but if you were to start the ball rolling and get stuck then post some images/errors, either myself or another in the community would be sure to assist at that stage I am sure.
If you have found my post helpful, please mark thumbs up.
Any other questions, just ask.
Thanks, Alan