See on my main computer (which is in the shop) the option to cloud save is there... but on my potato (which does play the game otherwise decently) has no such option...
if so, does it have the latest version of steam on it perhaps?
also, worse case scenario if it is a PC you can just transfer your save file via usb drive stick and then put it in to your other PC when its out of the shop
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on that first page make sure the box is checked that says; Enable the Steam Overlay while in-game
then next, click on the "UPDATES" tab at the top
and at the bottom, make sure the box is checked that says; Enable Steam Cloud synchronization for Baldur's Gate...
this will make it so no matter what PC you play on, as long as it has steam you can play it on multiple PCs
if you are trying to save through multiple devices like phone and tablets then i have nothing unfortunately
if so, does it have the latest version of steam on it perhaps?
also, worse case scenario if it is a PC you can just transfer your save file via usb drive stick and then put it in to your other PC when its out of the shop