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`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

Checked

Checked October 21, 2026 on a HubSpot developer test account

Area

Tags

campaigns, assets, asset-types, workflow, case-study

More facts from this area

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
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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