I have been on the developer beta since the beginning. It has been very stable for me other than the Files app (please see attached graphic). When I first installed the beta the Keynote folder populated with all of my presentations right away, but none of my Pages, Numbers or GarageBand files are visible. This behaviour has continued right through to the current beta.
Additionally, I am unable to transfer files from Dropbox into any of these folders.
I am curious if this is consistent with other people's experience or if it is specific to my machine (256GB 10.5” iPad).
Thank you, in advance, for any help or thoughts you can share!