Is there a way to limit the Asset upload directory in Redactor? I am looking to control what asset directories are available from the image upload button in a rich text field. Is this possible?

Also, does anyone know the Redactor setting to set the default size of the editor? I can't seem to track it down.

Thanks!
Is there a way to limit the Asset upload directory in Redactor?

No. You'll want to use a Matrix Field with an image block.

That said, it's possible you could create a Redactor button that does this via a plugin, but it'd probably be a bit of work.

Does anyone know the Redactor setting to set the default size of the editor?

The setting your looking for is minHeight.  Here's an example:

{
    buttons: ['html','formatting','bold','italic','unorderedlist','orderedlist','link','image','video'],
    plugins: ['fullscreen', 'pagebreak'],
    minHeight: 200
}


A longer discussion on custom Redactor toolbars and a few more examples can be found in this article: Custom Redactor Toolbars for the Rich Text Field in Craft CMS