When you become an affiliate or partner on twitch you have the option to upload at least 3 emotes to your channel at the following levels

Start by heading over to your Creator Dashboard

Next, we're going to look at the left side drop downs and head to "settings" and go to "Viewer Rewards"

If you already have emotes uploaded you'll be able to view them here as well

Since I'm full-up on emotes I've used some screenshots from twitch's own article on how to upload your emotes:

Towards the bottom of the page, you'll see the following options

Thankfully due to a new update twitch only ask for a file with the following

Meaning that if you choose one file to upload it will automatically downsize for you. Here are the advanced options where all 3 file sizes for your emotes are required

Unfortunately, unless you're a partner or affiliated on these platforms you get to see very many of the options for uploading emotes and badges, however, it's great that YouTube & Facebook provide articles to assist you on your way, check them out at the links below.

Channel membership perks and how to use them: https://support.google.com/youtube/answer/7544492?hl=en-GB

Supporter Stickers: https://www.facebook.com/business/help/767160797072449?id=648321075955172