I have a spreadsheet that contains images in Google Sheets. Interestingly, if I select cells that contain images and copy and paste them to a Proton spreadsheet, the images will be copied over.

I would really appreciate this feature because I frequently use spreadsheets to organize inventories of items. Being able to put an image in a cell greatly improves the readability and users can differentiate between items at a glance when some items have very similar names.