Your Facebook caption template
Build the caption every Facebook post uses, with tokens for your Amazon link, video title and hashtags.
Settings → Accounts & platforms → Facebook, under Your Facebook caption, has an editor for the caption your Facebook posts use.
Tokens
You can add chips for Amazon link, Video title and Hashtags. The Hashtags chip decides where your hashtags go: with it in the template, the hashtags that end your caption or video title post at that spot instead, each one once, so a sentence of your own can sit before them. Without the chip they stay at the end of your caption. The Amazon link chip decides where the link goes: put it before more of your text (for example a line of your own with the chip, above your caption) and the link posts right there, once. With the chip at the very end, or left out, the link goes on its own line after your caption. A post with no link leaves nothing behind where the chip was: no blank line. Your own caption text isn't offered as a chip — it's already the first line by default, so adding it again would just duplicate your words.
The default
Left untouched, the caption is your TikTok caption followed by your Amazon link on its own line. Saving a template you haven't changed publishes exactly that, unchanged. One thing is added at posting time: a Facebook post that carries an Amazon link or your own affiliate link adds #ad just before the link (at the end of the caption when the link goes after it), unless your caption already discloses. That is a separate switch, not part of the template; see Where your Amazon link goes on Facebook.
Limits
A caption template can run up to 1,000 characters. Typed URLs aren't allowed in the template itself — Facebook's own tagged link is added automatically, so a link would double up or be stripped at posting.
Where it applies
The template is saved to your account and applies to every Facebook post: automatic and scheduled posts, and Post now from the desktop Composer or the phone app. A caption you type in the Composer or the app fills the caption chip, so the template's other text and tokens still wrap it. The summary line at the top of Facebook's settings (Settings → Accounts & platforms) and the phone app's posting setup summary show whether your own template or the default is in use. You can edit the template here or in the phone app's Facebook settings; both edit the same saved template.
See Caption cleanup for what happens to TikTok-only hashtags in automatic posts first.
Keep Your caption in the template: without it your TikTok caption is replaced on every Facebook post (the editor warns you). A template that comes out empty for a video posts your plain caption instead. With no template saved, or a blank one, Facebook posts use your caption: a missing or blank template never makes a post go out without a caption.