Some emojis work, but others (like the heavy checkmark) do not. They’ll look fine in the editor, but your prospect will only see a blank square on the proposal page. You can still add emojis to your proposal, though. The trick is to grab an image online, then save that to your image library. From there, you can add the emoji to your proposal. Click here for more information on images.
If you’re looking to add an emoji right next to a list of text create a content table in your proposal with two columns. Place the image in the left column, and your text on the right.
This keeps your images in-line with your text.