Build a PowerApp Portal to allow external anonymous users to upload files to existing PowerApps system.

[MarrinerDev]

We've built a internal canvas PowerApp which uses Azure SQL to store its data and SharePoint to store file attachments. This all works well for our internal staff.

There has been a request from management to allow external members of the public to upload simple requests into this system. As part of the old system (pre-PowerApps) there is a Drupal-based web form which external anonymous users can fill in and optionally upload files (to a staging server). I think there are two approaches to migrating this form to work with our new PowerApp system:

(1) Build a PowerApp Portal to replace the old web form.

(2) Redirect the existing web form's HTTP POST output to point somewhere where our PowerApp system can pick it up. e.g. HTTP endpoint for a PowerAutomate Flow?

I've built a lot of canvas PowerApps on SQL/SharePoint but never used DataVerse or Portals. So my question for this Portal forum is whether Portals are an efficient way of achieving what we need? i.e. capture about 20 form fields and allow a user to upload one or more files and have this form data end up in SQL and the files in SharePoint?

If the direct Portal/DataVerse to SQL/SharePoint integration is a pain, then it could be a pull model whereby the PowerApp queries DataVerse store and we pull the content over manually.

Any thoughts on architecture or pro's/con's of Portal versus PowerAutomate HTTP call would be appreciated.