Add a checkbox ☐ under Photo Info /Custom Settings / Edit
You can copy one here: Use a Unicode Text Trick to Make Lists with Checkboxes save it in a Word document and CTRL-C it to paste it in LR.
Have a nice day
Won't this just add a checkbox symbol to an image?
I do not intend to print the contact sheet - i want to send it as a pdf.
I need to add interactive check-boxes to a pdf file.
will this do it?
I don't think that can be done in LR.
You will need Acrobat Reader for that.
If your client (or PDF receiver) has a PDF program, they could be able to indicate on the PDF in some way the selected images, and save, and return it to you.
The freeware Foxit Reader has a 'Stamp' tool with a selection of stamps that can be applied anywhere on a PDF.
This could be a work-around for your question.