Cannot snap to curves

Hi,
Unable to snap - or very limited snapping. No ‘near’ at all, and ends of curves sometimes if the curve is selected.
The horizontal plane stuff is an imported .dwg survey.
The vertical plane stuff is a jpg converted to a dxf then imported.
Please advise on how to share file with you and any other info you require.
Any help appreciated!
Thank you,
David

I’ve solved this.
There was geometry spread over a large area that I was unaware of.
Removing this and reducing the area with geometry on solved the snapping problem.
Can still share file if anyone is interested.
Thanks.

Hi David -

Yes, please post a file that shows this behavior.
-wim