In Appian 16.1 - what are the precise constraints about mobile devices uploading

In Appian 16.1 - what are the precise constraints about mobile devices uploading documents using SAIL (word / pdf etc.)
On the couple mobile devices I have tried my selection seems limited to taking photos, uploading photo's or dawing a signature. Our use case is that the process involves uploading supporting documentation which may be located in mobile accessible repositories such as dropbox, goodgle drive, onedrive, iCloud or the android file system.

I've seen this is achievable through other mobile applications (the Yammer app is an example).
Are there particular versions of IOS and android that can meet this use case?

OriginalPostID-194286

OriginalPostID-194286