This is my favourite tool for sending files that are too large for email. Nice simple interface, the option of password protection, and up to 100MB per “drop” free of charge.
(Bonus factoid: the .io domain name is from British Indian Ocean Territory, which happens to be where the Chagos Archipelago can be found. There is an on-going campaign, worth supporting, to turn the islands into a protected area. It’s one of the world’s most biodiverse marine ecosystems and the largest coral atoll in the world.)