Attachment works for (text) nodes because they have anchors - you should see green attachment dots when drawing new lines or moving existing lines.

When using draw.io I’d suggest exporting to PDF instead of PNG so you keep it as vector graphics.

> When using draw.io I’d suggest exporting to PDF instead of PNG so you keep it as vector graphics.

I had trouble getting that working (admittedly years ago) and as long as you have a high enough resolution people can't really tell a difference between it and SVG, though obviously it will make the filesize bigger.

Just tried the text nodes and indeed the arrows work. I guess I would also suggest doing the same for regular shapes.