Question about tablet dell latitude 7350,dongle vga usb? power bank

Hello everyone, I'm new to your chat, I need help,
a friend sold a tablet dell7350 with a docking station K10A and I have questions
1. Is there an adapter when connected to the tablet via a data plug to work with a USB flash drive autonomously, the tablet is charged from its tablet battery, not connected to the mains voltage
2. Why is the tablet not charging when the power bank LA45NM170 is connected through the docking station K10A, if the power bank is turned on in the tablet socket, it is charging, and the same 4.5 * 3.0 pin is the same 4.5 * 3.0 pin on the docking station and on the tablet, the power bank is 45W

 continue the topic of discussion on the tablet dell 7350
there is on the internet
 Dell XPS10 Power Port to HDMI USB VGA 8N4VR-L10 VJY9R XPS 10 Tablet Adapt
It can be connected to the power port of the tablet dell 7350? there is also a 40 pin plug
Will the adapter work stand alone, will it work usb port, will it be able to transfer files if the 7350 tablet is not connected to mains power supply through the socket?
If you connect a power bankPH45W17-AA  to the tablet, it will transfer files via usb port?
I hope someone can give me an answer