das ist gut, As I understand it, you installed the version for 8.1.
In order to add the necessary folders for viewing, click
+ (create)bottom in the toolbar then
To add, choose
Phone Folder, and there is already the desired folder.
As far as I can tell, there is no separate folder for files received via bluetooth in the phone. Depending on the type of file, they are saved in the profile folder of the memory that is selected for saving in the phone settings. Music files in the Music folder (in a folder with an alphanumeric name), image files in Pictures (Saved Pictures). I don’t understand where the documents are saved. I did not find the PDF document transmitted via bluetooth, although the ad reader in the phone sees and opens it.