I have mp3 and wav attachments from Dropbox added with the Airtable filepicker, so they are not uploaded but shared with the link. But this is not working. It shows only in the Android app a document which seems not to have the right mime type and so there is no option to open/share it with an audio player.
If I use the shared URL from Dropbox directly as a link attachment, it opens the Dropbox app as expected which asks to open it with a player etc. This IMO also the expected behavior if working with Dropbox attachments.
So something is not implemented correctly with Dropbox attachments.