Sean & All,
Thanks for the clarification. I have noticed that a download of an attached internal file only happens when you initiate it. I think that's a good feature, so you can select which files to have locally on the device. I also think this is a practical security feature, so that you don't have to worry about sensitive files being automatically placed on a mobile device.
Unless I have some obscure setting wrong on Windows 10 'File Explorer' you cannot 'see' any TB files on my Android phone (either phone itself or SD card). Nor can you find any TB data folders or attached files. I guess this is good as there is no way you can muck up the database structure. I also was not able to find an attached test file using the Droid file search, again maybe that's a good thing. I did however find the folder structure using another 'file manager' app (using search only). But what I found was buried so deep there is no way it would be practical to try to find data or files, this is probably good. If it's not readily seen no one would know it's there. So unless developers eventually include some kind of Android / iOS internal statistical report so you can see how big a brain on the device actually is, I guess if we run out of room, we'll just have to buy a bigger SD card. FYI, I did find out the structure appears to be placed on the SD card, so Kudoos for that!
I was concerned about a brain containing sensitive data being accessible on a mobile device without being encrypted, but with a database so obscure, there's probably not much to worry about. maybe an option to either have a local password or the users online password would provide sufficient security. Thoughts???