Maximum size for save to roblox option

Can’t find any document point that out. In studio, whats the maximum size to save a folder to roblox?

Do you mean the maximum file size of a Roblox place file?

You may find some relevant answers here.

the model size,right click a model or folder to save it to the roblox

Not really an answer but I doubt that you would run into any issues with model sizes, as you’d likely need to export something purposefully ridiculous and unreasonable to do so. Even so I do not believe there is any documentation of such a thing, hence I cannot provide an actual answer.