Multiple checkboxes to populate single cell

Good morning all. I'm really hoping someone can guide me through this...
I have a tracker, when double-clicking a cell in "D", it opens a userform. This userform is a MultiPage with multiple checkboxes per page. The idea is that the user can select all of the nonconformances on an inbound shipment and populate the spreadsheet. I've created the userform with a command button on each of the three pages but also a single command button outside of the multipage box (ideally, they click all boxes between the 3 multipage tabs and then hit a single command button to populate everything at once and clear the form).
Unfortunately, I need all checkboxes to populate a single cell, hopefully one line at a time with a bullet point and the cell simply gets taller as needed. I seriously doubt I've explained this well enough, so I've added a sample form. Just double click in the "D" column and hopefully you'll see what I mean (and hopefully I attached it correctly).
Thank you all so much for your assistance!

Similar approach

Perfect! Thank you so much!

OK, your code was perfect and did what I wanted, but the customer has asked a question, if I can create 3 columns (D, E and F), one for each of the non-conformance types (Container...page1, Shipment...page2, Documentation...page3), then populate the spreadsheet based on each of the three pages in the multipage form.

Both solutions worked, and it was just a request from our on-site customer to see if I could do it, I can assure you I don't get paid for this, I'm a Quality manager, not IT or anything else like that. And I understand, I'm not asking for anyone to do all the work for me, I have some work-arounds that I've done, but considering my experience in coding is so limited, there's always a better way (i.e. cleaner) to do it.

Perfect again, and I learned a few things from this exercise to boot! Thank you