Here's a collection of various AO3 exchange & art posting related resources that some participants found helpful last year.
AO3 Exchanges: Breakdown & Resources
This is an AO3-based exchange, so everything you do for the exchange -- from nominating fandoms/characters, to receiving your signup, to submitting/posting your gift and treat(s) -- is going to happen through AO3, exactly the same way a fanfiction exchange would.
During the nominations period all potential participants are able to use the Tagset to anonymously nominate fandoms, characters, and ships they might want to offer or request in this exchange.
When nominations close and signups open, you will be able to use the AO3 signup form on the AO3 Collection (linked in this post) to request and offer different fandoms, characters, ships, and objects/settings that were nominated in the tagset. (You will not be able to request or offer anything that is not in the tagset.)
When you get matched up with a recipient, AO3 will send you an email telling you what their requests are so you can create for them! AO3 will also generate an Assignment page for you, which is your assignment for the exchange.
And finally, when you create your gift, you will post it on AO3 using the Assignment page. Because of AO3's handy challenge and collection settings, the mods for the exchange will be able to keep everybody's gift hidden and anonymous until the exact same time :)
Posting Art to AO3
Date: 2022-05-29 06:53 pm (UTC)AO3 Exchanges: Breakdown & Resources
This is an AO3-based exchange, so everything you do for the exchange -- from nominating fandoms/characters, to receiving your signup, to submitting/posting your gift and treat(s) -- is going to happen through AO3, exactly the same way a fanfiction exchange would.
During the nominations period all potential participants are able to use the Tagset to anonymously nominate fandoms, characters, and ships they might want to offer or request in this exchange.
When nominations close and signups open, you will be able to use the AO3 signup form on the AO3 Collection (linked in this post) to request and offer different fandoms, characters, ships, and objects/settings that were nominated in the tagset. (You will not be able to request or offer anything that is not in the tagset.)
When you get matched up with a recipient, AO3 will send you an email telling you what their requests are so you can create for them! AO3 will also generate an Assignment page for you, which is your assignment for the exchange.
And finally, when you create your gift, you will post it on AO3 using the Assignment page. Because of AO3's handy challenge and collection settings, the mods for the exchange will be able to keep everybody's gift hidden and anonymous until the exact same time :)
Here is a tutorial for posting to a challenge/exchange on AO3 (it uses fic-centric language but the basics are the same for art)
Here is a general tutorial for posting works on AO3
Hosting & Posting Art to AO3
Here is an assortment of resources with different people discussing how they post their fanart to AO3.
AO3 hosted tutorials:
-Embedding Media at the Archive Of Our Own (official admin post; if you scroll down to "Inserting Art" you'll see some image hosting suggestions from the AO3 admins, but you will also see that all the admins' image hosting examples have been noted "Caution" or "Not Recommended"... YMMV but I suggest looking into the resources below for image hosting guidance)
-Tutorial on putting pictures and gif on AO3
-...and if you're feeling really brave, How To Size Images on AO3 and How To Make Images Fit In Mobile Browsers
Other resources:
-How to post images within a story on AO3 (Dropbox hosting)
-How to post fanart on Archive Of Our Own (imgur hosting, deviantART hosting)
-Reliable Long-term Image Hosting Sites (list of image hosting sites, includes Discord)
-Any advice on adding fanart to your fanfic on AO3? (see comments)
-Discussion of image hosting, specifically on Discord
-Traditional artists discuss scanning, image hosting, and uploading to AO3