uplay locate partially downloaded folder different pc

I've found forums that are a few years old of this happening to others. My current chances of Steam recognizing that even one game is installed, completely random game, by restarting my computer sits at about 2% so far. The only option available is to restart my computer a few dozen times. I've tried to move the installation folders around. An option, to the best of my knowledge, does not exist for forcing the Steam app to check the integrity, even the existence, of the installed games when the app refuses to recognize that they're there. I have attempted to allow the app to download the game entirely, which simply created another set of files and folders for that game.

I have uninstalled the app and reinstalled it. Attempting to 'Repair the folder', the game folder, the option to do so being in the Downloads > 'add a steam folder' sort of button at the top of the Downloads page > hitting the '+' sign to the right of the displayed folder in which the games are installed, does absolutely nothing, even though the app returns with a message indicating that it has indeed been repaired. I have since uninstalled a few games to nudge the app into doing so, but the app simply attempts to download the full game again and ignores the game files that already exist. Because my hard drive was as full as it was, I couldn't tell the Steam app to re-download a game, thereby forcing the app to realize that it is indeed installed. Using any of my three actively used Steam accounts, the Steam app refuses to recognize that there are games installed. I'm having a serious issue with Steam and I don't know how to solve it.

Uplay locate partially downloaded folder different pc