I have difficulty believing that a spider that big could be crawling on a smooth, flat, and vertical pane of glass. I know spiders have magical powers and all, but the ability of small bugs to go up vertical surfaces is limited by weight. That looks like a string holding it up.
Of course, if it’s real, we’ve finally found a legitimate household use for tactical nuclear weapons.
Maybe it has suction feet, like frogs.
Geckos which are much heavier can walk upside down on a ceiling.
When I lived in the Philippines, we use to catch them, and they could be up to a 6-12 inches long with an outsized head as wide as a shot glass, so...pretty heavy.
I had a broom, and swiped at one to knock it down to catch it, and it fell alright...right onto my upturned face.
As I shrieked and frantically swiveled my head from side to side in panic, I knocked my glasses off.
They came to rest about five feet away with the gecko firmly holding onto them still!