PainterNode: no disk data being stored, any Undo wipes the canvas

[dryodryo]

Hello,

Thank you for the PainterNode, it seems that it may be immensely helpful for controlling composition.

I am having an issue where if I apply the CTRL+Z command to Undo, the PainterNode resets the canvas size to 512x512 and erases the drawing. It does not matter how many steps back the canvas size was changed. The Undo command wipes out the drawing even if the canvas size was changed many steps earlier.

Without any documentation, I do not understand what is going on with image files in general. I see the "Save canvas" option in Settings. I see that the "Image" parameter field reads "Paint_26.png". I see that a black 512x512 file with that name exists in my ComfyUI/input folder. But I am not able to select any other file from the "Image" field, even though all of the images in the ComfyUI/input folder are listed there.

If I save the workflow to .JSON and reload it, the PainterNode is reset to the default 512x512 and the canvas is black.

How do I get the PainterNode to actually store and load from disk?

How can I use the global Undo command without wiping out the drawing?

If these issues persist, then the PainterNode is of no use to me whatsoever. I might as well just draw in some other application.

OS is Windows 10, browser is Firefox. Ad blockers are disabled.

Please help. Thank you again.