CRM Note - More consistent and flexible image attachments

[aheart]

Is your feature request related to a problem? Please describe.
When you're adding/editing a CRM Note you can upload an image and it will be embedded in the text field.
Unfortunately there's no way to embed images that have been uploaded previously.

One example where this was a problem - I've attached an image to a CRM Note, then changed its visibility from public to private and the image is no longer showing up in the note because the link changed.

Describe the solution you'd like
Instead of only allowing to upload new images it would be more consistent and flexible to show the upload dialog when embedding an image.

Describe alternatives you've considered
A different solution, that would allow attaching existing images would also do fine, it doesn't have to be the dialog from the image above.

Additional context
Tested on ERPNext: v14.47.0 and ERPNext: v15.0.0