For android mini pc products which has build-in Bluetooth function, you can use "Bluetooth File Transfer" App to transfer files between smartphone / tablet and Android mini pc.
Bluetooth file transfer allows to use smartphone to browse, explore and manage files of any Bluetooth ready device, using File Transfer Profile and Object Push Profile, you can also receive files and send contacts.
Please get the featured App from Google play store:
https://play.google.com/store/apps/details?id=it.medieval.blueftp&feature=search_result
