Publishing connections live on Settings → General, in the Integrations card. They belong to this brand only. Connecting YouTube on Brand A does not connect it on Brand B.
Rows appear only when that deployment option is available on your team. If a platform is missing, it is not a broken page.

You need brand publishing permission (typically a brand owner or admin, or a team owner).
Do not screenshot or copy the provider's consent screen. Permissions and layouts change on their side.
Use this to upload videos from the video editor.
Disconnect YouTube removes the connection from this brand.
Use this to publish Page posts or run paid placements from the video editor.
If no Pages are found, confirm you manage a Facebook Page, that the authorization included Pages, then return to Settings and connect again.
When connected, the row shows the Page, the ad-account name or No ad account, and Connected or Needs attention.
You can Change Page or Add Ad Account / Change Ad Account without repeating the full OAuth flow while the authorization is still valid. Disconnect Meta also deactivates the Instagram connection that was derived from this Page.
Instagram does not have its own sign-in button. It is derived from Meta.
Requirements:
A connected row shows @username. Use Instagram to import post images and publish static ads. Importing ad-account images also needs a selected Meta ad account.
Disconnect Instagram removes only Instagram. Disconnecting Meta removes both.
Use this to deploy videos from the video editor.
Disconnect TikTok removes the connection from this brand.
A Needs attention chip means the saved authorization is expired or the selected Page/account is no longer valid. Disconnect and connect again, or use Change Page / Change Ad Account for Meta.
If deploy from the editor still fails after a green Connected chip, see Help.