Description: When I scan a document and attempt to export it to Dropbox, the wrong screen appears and Scannable fails to export the document.
Steps to reproduce:
1. Scan a document using the free version of Scannable on iOS
2. Click Share
3. Click the Dropbox logo
4. Notice that Dropbox authenticates but then a modal with Message/Save To/To appears instead of the Dropbox save screen.
Expected behaviour: correct folder can be selected and document is saved into Dropbox
Observed behaviour: incorrect window appears
Workaround: instead of selecting the Drop
