Hi, I have some experience with Power Apps (canvas apps), but I have never built any Model-driven apps or Portals and hence my question(s) - I am planning to build my first PowerApp Portal for a client, and the back-end is going to be Dataverse. They will have a few external users, which is why we are taking the Portal route. So what I would like to know is - do these external users need any separate premium licenses for Dataverse? I know Dataverse connectors are premium connectors, so I'm a bit worried. We will just go with the 100 capacity licenses for external users, and if that doesn't suffice, we will buy another 100 licenses. My main worry is re. those premium connectors for Dataverse.
Also, the PowerApps Portal will have an advanced form, which is quite a huge form actually (with around 200 fields on it), and a few file attachments as well. Just wondering - where will those attachments be saved? Do they get saved to Dataverse as blobs? Could there by any performance implications with such a huge form? The client does not want to break it up into smaller forms, unfortunately. If you foresee any issues with this, please let me know.

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