Uploading images to pluginsmy_plugin/images

I’m writing a plugin (my first) that needs to let a user upload images to an images folder within the plugin folder. I’m not finding the tools to do this though, like the prompt to browse the local machine for the image. I know I can upload images with the dashboard Media function, but those images end up in wp-content/uploads folder.

I’d also like to create a thumbnail of the image, so the upload would put two images into the folder.

Can someone suggest the best way to do this?

Thanks