What's the policy regarding uploading for artists like "and,"
who post pictures to their twitter first, before consolidating a bunch of twitter posts together in a pixiv post?
You upload the twitter post, and then later on make it a child of the pixiv post?

Alice_Christine said:

What's the policy regarding uploading for artists like "and,"
who post pictures to their twitter first, before consolidating a bunch of twitter posts together in a pixiv post?
You upload the twitter post, and then later on make it a child of the pixiv post?

Just like you said.

1. Upload from Twitter first.
2. When the higher-res version is up on Pixiv, make the high-res one the child.