> ## Documentation Index > Fetch the complete documentation index at: https://docs.conversion.ai/llms.txt > Use this file to discover all available pages before exploring further. # Campaign Assets > Build a campaign's emails, forms, workflows, and files inside the campaign itself. Build the assets for a marketing effort on the campaign's **Assets** tab. Keeping them here means everything for the campaign is in one place, and your emails and forms can personalize with the campaign's tokens and each member's fields. | Asset type | Description | | ------------ | --------------------------------------------------------------------------------------------------------------------- | | **Email** | Blast emails and workflow emails. | | **Form** | Embedded or external lead capture forms. | | **Workflow** | Automated sequences of actions triggered by contact behavior. | | **File** | Slides, a one-pager, or anything else you link from an email. See [public files](/product-docs/content/public-files). | You can add [folders](/product-docs/folders/overview) inside a campaign to group assets. A campaign cannot contain another campaign. Keep a campaign's emails inside the campaign. Tokens and member fields such as `{{ campaign_member.webinar_url }}` resolve against the campaign an asset belongs to, so an email kept elsewhere renders them empty. A campaign cannot be deleted while it still holds assets. Move or delete them first. ## Related * [Tokens](/product-docs/campaigns/tokens) for reusable values across a campaign's assets. * [Members](/product-docs/campaigns/members) for per-contact member fields. * [Liquid Overview](/product-docs/liquid/overview) for referencing both in your content.