Apologies for delay in updating, I have been in the field with no cell or internet access, but here is the final analysis of the pairing problem with the Galaxy S7.
The S7 simply would not accept the info typed from the keyboard into the text boxes for device name and password. Nothing would go into the Name textbox and no matter what was typed, only "0000" would go into the password textbox. Could not paste into either textbox.
Had to give up on the S7, but used an older smart phone which initially gave me trouble in accepting the textbox input just like the S7, but eventually accepted it and then seemed to work well, aside from the unplugging and replugging of the USB connection in order to reconnect as slave each time the RC had been powered down then back up. (This is a known issue to me with using devices as slaves, and I tried this multiple times with the S7 before giving up on it)
Have not encountered this problem with any of my other android tablets so I can only assume that there is an incompatibility of the newer Android OS with the latest DJI Firmware (using the newest xxx.30). I had seen this referenced in an earlier forum post.
Steve