Need PowerApp to get the files attached to a SharePoint List Item. Need to be able to check if any files are attached and open the files or save the files. Must be able to handle zero, one or multiple files attached to a SharePoint List item. This capability would enable a wide range of business applications like contract approval where contractors fill in a form and attach one or several files then save (submit). The Power App would have to support attaching files, detaching files, iterating over the files attached to a single list item, and processing file attachments.
It would be extremely useful if PowerApps supported a way users could easily opening or preview attached files in a viewer similar to SharePoint online WOPI frame. Approval workflows often require reviewers to read the list entry and view the attached files before approving, rejecting or adding a comment to the list entry.