I love this concept, and it's great to see the current support for dragging and dropping images and PDFs.

I was checking out the functionality and tried dropping a couple different formats into the host screen (Word documents, Excel spreadsheets, .txt files), and the host screen would either do nothing or get stuck on the validating screen. I'm guessing this is because these aren't currently supported types. If this is the case, I'd suggest notifying the host that the file type is not supported.