In my limited experience, 3G is often problematic. It's best not to use it unless you must, like in the car, or for those features which only work on 3G. It also saves you bandwidth to use wifi when available. It's possible that your 3G was running slow and timing out before the information made it to the site. Where I live, theoretically we have 3G on all networks and 4G on some, but in reality we're usually on the Edge network or equivalent, which makes it more or less impossible to use it for anything more than text email.

you could make some side rails, they lay slats across them, or get some Metal L Brackets.

Base cabinets were mentioned once. They would be good bracing! It seems the discussion went towards braces that you buy in a store. To attach base cabinets as bracing one will need angle iron, and a lot of fine tuning work in terms of the cabinet feet and height above the floor. Uh-oh. Sounds impractical now. So, the 90 degree braces at floor level now seem to be the best thing to do. mudworm, on lowes.com I entered two keywords: aluminum tube. I got positive results. Here are some of them. Item #: 215640 Item #: 216100. Go to wherever they have these in the store and you will see steel tube too. Or, web search for steel tube. I just figured that "aluminum tube" would be easier to search for. Buy aluminum tube if there is no steel. Once a metal is made into a tube it is very rigid. In home depot I have also seen steel and aluminum tube. So, tube IS available if you know where to get it. Tube is stronger than thin flat metal. If you add tube on top of the braces you will have both the benefits of what advertguy proposes and the benefits of the 90 degree bracing, and no deleterious secondary impact. advertguy in your latest post "Remove those braces from the bottom" is not clear. Hth

In many cases stairs enclosed on both sides or have a half-wall or railing if the basement is finished. In older homes, staircases open most of the time, and now when the house is being sold they must be enclosed or framed to comply with the code and have a graspable handrail... without that they will not issue a certificate of occupancy. Here is an example we just had to do in one of the houses that failed inspection.