Attachment open function

Question

Hello,
We are setting up a company bulletin board using PowerApps with our partners.

I heard from the partner company that the two functions we need cannot be implemented due to the limitations of powerapps.
I'd like to know if it's true or not.

1. In PowerApps, do I have to check the attached file after downloading it?
   Is the file open and preview function impossible to implement?
2. Is it impossible to copy/paste local images when uploading posts in PowerApps?
   I know that server images such as Google can be copied and pasted.

I think it's a comprehensive question. However, please answer whether it is possible or not.

Best regards!