Thank you for the instructions, and sorry for lagging - I've had some fires to put out over the last few days.
I tried following the directions. I have a folder shared on the Windows computer, It is viewable and editable from other computers on the network. I open the iPad, connect to our local WiFi node, and the shared folder is also visible. I followed the directions for the Network icon, and the SMB/CIFS link. The shared folder is visible, and I put in the login information, just as I do when logging into the machine. It seems satisfied, but when I try to open the folder, nothing happens for about three seconds, then it pops up a message box saying "Operation timed out". I tried the Password Lock slider in both positions. In the On position, attempting to open the folder pops up another request for a password, in the Off position, this dialog does not appear, but in both cases, the end result is the same: "Operation timed out".
The dialog for entering information about the shared computer has the word 'Advanced' in the lower right corner, which I thought might open some further possibilities, but it is inactive.
The password to this machine is not trivial, but I have used it for many years in this network. I have entered it repeatedly, and checked very carefully, letter by letter, as I enter it. I am 100% certain that I am entering it correctly.
I don't know what to try next. The dialog for locating shared folder also shows my Box folder, but besides the endless nagging ads, it is unreachable offline, so that is no good.
I also had the entire Box app go under - completely unreachable. Constantly wanted a password, but then refused to log in, even when online and given the correct password. A few seconds of nothing, then back to the desktop. I had to uninstall the entire app, re-install it, and download all the videos again. Several hours of PIA, but at least I have them videos viewable again, even if through Box's less than stellar player.