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Attaching an asset to a campaign is `PUT /marketing/v3/campaigns/{campaignGuid}/assets/{assetType}/{assetId}`, which answers 204. Measured for `FORM` and `MARKETING_EMAIL`.

Measured

Checked

Checked October 16, 2026 on a HubSpot developer test account

Area

Tags

campaigns, assets, attach, forms, marketing-email

More facts from this area

WORKFLOW and CASE are not campaign asset types (both return 400); the valid names are AUTOMATION_PLATFORM_FLOW and CASE_STUDY. The 400 for an invalid type lists the valid set.Measured
The Campaigns API needs Marketing Hub Professional or higher.Source pending
A campaign read returns 7 default properties plus assets unless properties names the ones wanted. With properties, the default system properties are dropped and unset properties are absent, not null.Measured

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